ETH Price: $2,676.22 (+1.78%)

Token

Stellar Inu Elemental NFTs (SNFT)
 

Overview

Max Total Supply

134 SNFT

Holders

73

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A
Balance
2 SNFT
0xab299d60d2b3b11c143c4a582046effafc00e59f
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Contract Source Code Verified (Exact Match)

Contract Name:
StellarInuNFTs

Compiler Version
v0.8.11+commit.d7f03943

Optimization Enabled:
Yes with 100 runs

Other Settings:
default evmVersion
File 1 of 20 : StellarInu_Staking_NFTs.sol
/***
 * Written by MaxFlowO2, Senior Developer and Partner of G&M² Labs
 * Follow me on https://github.com/MaxflowO2 or Twitter @MaxFlowO2
 * email: [email protected]
 *
 * Purpose: Chain ID #1-5 OpenSea compliant contract
 */

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "./interface/IMAX721.sol";
import "./modules/ContractURI.sol";

contract StellarInuNFTs is ERC721, ERC721URIStorage, ContractURI, IMAX721, ReentrancyGuard, Ownable {
  using Counters for Counters.Counter;
  using Strings for uint256;
  Counters.Counter private _tokenIdCounter;
  Counters.Counter private _teamMintCounter;
  uint private mintFees;
  uint private constant mintSize = 3500;
  uint private teamMintSize;
  uint private constant totalChoices = 5;
  uint private thresholdAmount;
  string private base;
  ERC20 private ERC20Address;
  address private constant DEAD_ADDRESS = 0x000000000000000000000000000000000000dEaD;
  bool private enableMinter;
  mapping(address => bool) public hasClaimed;

  // @notice all events within contract, will be explained in functions
  event UpdatedBaseURI(string _old, string _new);
  event UpdatedMintFees(uint _old, uint _new);
  event UpdatedThresholdAmount(uint _old, uint _new);
  event UpdatedMintSize(uint _old, uint _new);
  event UpdatedMintStatus(bool _old, bool _new);
  event UpdatedTeamMintSize(uint _old, uint _new);
  event UpdatedERC20Address(ERC20 _old, ERC20 _new);
  event UpdatedTotalChoices(uint _old, uint _new);

  constructor() ERC721("Stellar Inu Elemental NFTs", "SNFT") {}

/***
 *    ███╗   ███╗██╗███╗   ██╗████████╗
 *    ████╗ ████║██║████╗  ██║╚══██╔══╝
 *    ██╔████╔██║██║██╔██╗ ██║   ██║   
 *    ██║╚██╔╝██║██║██║╚██╗██║   ██║   
 *    ██║ ╚═╝ ██║██║██║ ╚████║   ██║   
 *    ╚═╝     ╚═╝╚═╝╚═╝  ╚═══╝   ╚═╝   
 */

  // @notice this is the mint function, mint Fees in ERC20,
  //  that locks tokens to contract, inable to withdrawl, public
  //  nonReentrant() function. Must have IERC20 approval prior
  //  to minting! Call it within the application.
  // @param uint amount - number of tokens minted
  // ERC165 datum publicMint(uint256,uint256) => 0x98ae99a8
  function publicMint(uint amount) public nonReentrant() {
    // @notice using Checks-Effects-Interactions
    // @notice Checks Phase
    require(enableMinter, "Minter not active");
    require(_tokenIdCounter.current() + amount <= mintSize, "Can not mint that many");
    // @notice Effects Phase
    // @notice this transfers ERC20 token to 0xdEaD (ERC20.sol), contract
    //  must be approved prior to minting, use approve methods in web app
    uint tokenAmount = amount * mintFees;
    ERC20Address.transferFrom(_msgSender(), DEAD_ADDRESS, tokenAmount);
    // @notice Interactions Phase
    for (uint i = 0; i < amount; i++) {
      // @notice mintID() will use a psuedo-random number and plug it
      //  into a string with the return automatically, then Counter.count
      //  will auto increment the TokenID numbers
      _safeMint(_msgSender(), _tokenIdCounter.current());
      _setTokenURI(_tokenIdCounter.current(), mintID());
      _tokenIdCounter.increment();
    }  
  }

  // @notice this is the free mint if you hold a balance above a threshold
  //  stated above. Threshold is set by onlyOwner!
  function claimNFT() public nonReentrant() {
    // @notice using Checks-Effects-Interactions
    // @notice Checks Phase
    require(enableMinter, "Minter not active");
    require(ERC20Address.balanceOf(_msgSender()) >= thresholdAmount, "Do not hold enough ERC20 tokens to claim.");
    require(_tokenIdCounter.current() < mintSize, "Can not mint that many");
    require(!hasClaimed[_msgSender()], "Can not claim a second time");
    // @notice Effects Phase
    hasClaimed[_msgSender()] = true;
    // @notice Interactions Phase
    // @notice mintID() will use a psuedo-random number and plug it
    //  into a string with the return automatically, then Counter.count
    //  will auto increment the TokenID numbers
    _safeMint(_msgSender(), _tokenIdCounter.current());
    _setTokenURI(_tokenIdCounter.current(), mintID());
    _tokenIdCounter.increment();
  }

  // @notice this is the team mint function, no mint Fees in ERC20,
  //  public onlyOwner function. More comments within code
  // @param address _address - address to "airdropped" or team mint token
  // ERC165 datum teamMint(address) => 0xb6a1dba1
  function teamMint(address _address) public onlyOwner {
    // @notice using Checks-Effects-Interactions
    require(enableMinter, "Minter not active");
    require(teamMintSize != 0, "Team minting not enabled");
    require(_tokenIdCounter.current() < mintSize, "Can not mint that many");
    require(_teamMintCounter.current() < teamMintSize, "Can not team mint anymore");
    // @notice mintID() will use a psuedo-random number and plug it
    //  into a string with the return automatically, then Counter.count
    //  will auto increment the TokenID numbers
    _safeMint(_address, _tokenIdCounter.current());
    _setTokenURI(_tokenIdCounter.current(), mintID());
    _tokenIdCounter.increment();
    _teamMintCounter.increment();
  }

  // @notice this takes current information and creates a Psuedo-Random number
  //  for the x-types of NFT's you can get. Consider _tokenIdCounter.current()
  //  as a nonce, using block.timestamp, block.difficulty, and _msgSender() then
  //  modulo division by total number of NFT's
  function mintID() internal view returns (string memory) {
    uint value = uint(keccak256(abi.encodePacked(block.difficulty, block.timestamp, _msgSender(), address(this), _tokenIdCounter.current()))) % totalChoices;
    return value.toString();
  }

  // @notice Function to receive ether, msg.data must be empty
  receive() external payable {
  }

  // @notice Function to receive ether, msg.data is not empty
  fallback() external payable {
  }

  // @notice this is a public getter for ETH blance on contract
  // ERC165 datum getBalance() => 0x12065fe0
  function getBalance() external view returns (uint) {
    return address(this).balance;
  }

/***
 *     ██████╗ ██╗    ██╗███╗   ██╗███████╗██████╗ 
 *    ██╔═══██╗██║    ██║████╗  ██║██╔════╝██╔══██╗
 *    ██║   ██║██║ █╗ ██║██╔██╗ ██║█████╗  ██████╔╝
 *    ██║   ██║██║███╗██║██║╚██╗██║██╔══╝  ██╔══██╗
 *    ╚██████╔╝╚███╔███╔╝██║ ╚████║███████╗██║  ██║
 *     ╚═════╝  ╚══╝╚══╝ ╚═╝  ╚═══╝╚══════╝╚═╝  ╚═╝
 * This section will have all the internals set to onlyOwner
 */

  // @notice this will set the fees required to mint using
  //  publicMint(), must enter in whole tokens.
  // @param uint _newFee - fee you set, in whole ERC20 tokens
  //  as you see below, ERC20.decimals() is called in calculation.
  // ERC165 datum setMintFees(uint256) => 0x06b6f7e9
  function setMintFees(uint _newFee) public onlyOwner {
    require(address(ERC20Address) != address(0), "ERC20 token address not set.");
    uint oldFee = mintFees;
    mintFees = _newFee * 10**ERC20Address.decimals();
    emit UpdatedMintFees(oldFee, mintFees);
  }

  // @notice this will set the threshold required to mint using
  //  claimNFT(), must enter in whole tokens.
  // @param uint _newFee - fee you set, in whole ERC20 tokens
  //  as you see below, ERC20.decimals() is called in calculation.
  // ERC165 datum setFreeThreshold(uint256) => 0x06b6f7e9
  function setFreeThreshold(uint _threshold) public onlyOwner {
    require(address(ERC20Address) != address(0), "ERC20 token address not set.");
    uint old = thresholdAmount;
    thresholdAmount = _threshold * 10**ERC20Address.decimals();
    emit UpdatedThresholdAmount(old, thresholdAmount);
  }

  // @notice this will enable publicMint()
  // ERC165 datum enableMinting() => 0xe797ec1b
  function enableMinting() public onlyOwner {
    require(address(ERC20Address) != address(0), "ERC20 token address not set.");
    require(mintFees != 0, "ERC20 token mintFee not set.");
    require(totalChoices != 0, "mintID() will fail without totalChoices set");
    require(thresholdAmount != 0, "ERC20 token threshold not set for claimNFT().");
    bool old = enableMinter;
    enableMinter = true;
    emit UpdatedMintStatus(old, enableMinter);
  }

  // @notice this will disable publicMint()
  // ERC165 datum disableMinting() => 0x7e5cd5c1
  function disableMinting() public onlyOwner {
    bool old = enableMinter;
    enableMinter = false;
    emit UpdatedMintStatus(old, enableMinter);
  }

  // @notice will set the ERC20 value of token, and emit an event
  // @param address _token - address of the token to change
  // ERC165 datum setERC20Address(address) = > 0x26a4e8d2
  function setERC20Address(address _ERC20Address) public onlyOwner {
    ERC20 old = ERC20Address;
    ERC20Address = ERC20(_ERC20Address);
    emit UpdatedERC20Address(old, ERC20Address);
  }

  // @notice this will set the base URI for tokenURI() later on
  // @param string memory _base - new IPFS string base of tokenURI
  //  remember must trail with a "/"
  // ERC165 datum setBaseURI(string) => 0x55f804b3
  function setBaseURI(string memory _base) public onlyOwner {
    string memory old = base;
    base = _base;
    emit UpdatedBaseURI(old, base);
  }

  // @notice will set the ContractURI for OpenSea
  // @param string memory _contractURI - IPFS URI for contract
  // ERC165 datum setContractURI(string) => 0x938e3d7b
  function setContractURI(string memory _contractURI) public onlyOwner {
    _setContractURI(_contractURI);
  }

  // @notice will set "team minting" by onlyOwner role
  // @param uint _amount - set number to mint
  // ERC165 datum setTeamMinting(uint256) => 0xb1362ba1
  function setTeamMinting(uint _amount) public onlyOwner {
    uint old = teamMintSize;
    teamMintSize = _amount;
    emit UpdatedTeamMintSize(old, teamMintSize);
  }

  // @notice function useful for accidental ETH transfers to contract (to user address)
  //  wraps _user in payable to fix address -> address payable
  // @param address _user - user address to input
  // @param uint _amount - amount of ETH to transfer
  // ERC165 datum sweepETHToAddress(address,uint256) => 0xccf8f511
  function sweepETHToAddress(address _user, uint _amount) public onlyOwner {
    payable(_user).transfer(_amount);
  }

  // @notice function useful for accidental ERC20 token transfers to contract 
  //  (to user address) 
  // @param address _user - user address to input
  // @param uint _amount - amount of token to transfer
  // @param address _token - token contract address
  // ERC165 datum sweepERCToAddress(address,uint256,address) => 0xe08b1b63
  function sweepERCToAddress(address _user, uint _amount, address _token) public onlyOwner {
    IERC20(_token).transferFrom(address(this), _user, _amount);
  }

  ///
  /// @dev these are all the Interface Overrides/Getters
  ///

  // @notice this is a getter for ERC20 token set for this minter
  function ERC20TokenAddress() public view returns (address) {
    return address(ERC20Address);
  }

  // @notice this is a getter for ERC20 token set for this minter
  function ERC20TokenName() public view returns (string memory) {
    return ERC20Address.name();
  }

  // @notice this is a getter for threshold amount
  function ERC20TokenThresholdAmountForClaimNFT() public view returns (uint) {
    return thresholdAmount;
  }

  // @notice solidity override for _baseURI(), used in conjunction with
  //  tokenURI() as abi.encodePacked(base, tokenID) or in this case of
  //  using ERC721URIStorage, whatever is set.
  function _baseURI() internal view override returns (string memory) {
    return base;
  }

  // @notice solidity required override for supportsInterface(bytes4)
  function supportsInterface(bytes4 interfaceId) public view override(IERC165, ERC721) returns (bool) {
    return (
      interfaceId == type(ERC721URIStorage).interfaceId  ||
      interfaceId == type(ContractURI).interfaceId  ||
      interfaceId == type(IMAX721).interfaceId  ||
      interfaceId == type(ReentrancyGuard).interfaceId  ||
      interfaceId == type(Ownable).interfaceId ||
      super.supportsInterface(interfaceId)
    );
  }

  // @notice will return status of Minter
  function minterStatus() external view override(IMAX721) returns (bool) {
    return enableMinter;
  }

  // @notice will return minting fees
  function minterFees() external view override(IMAX721) returns (uint) {
    return mintFees;
  }

  // @notice will return maximum mint capacity
  function minterMaximumCapacity() external view override(IMAX721) returns (uint) {
    return mintSize;
  }

  // @notice will return maximum "team minting" capacity
  function minterMaximumTeamMints() external view override(IMAX721) returns (uint) {
    return teamMintSize;
  }
  // @notice will return "team mints" left
  function minterTeamMintsRemaining() external view override(IMAX721) returns (uint) {
    return teamMintSize - _teamMintCounter.current();
  }

  // @notice will return "team mints" count
  function minterTeamMintsCount() external view override(IMAX721) returns (uint) {
    return _teamMintCounter.current();
  }

  // @notice will return current token count
  function totalSupply() external view override(IMAX721) returns (uint) {
    return _tokenIdCounter.current();
  }

  // @notice _burn override
  function _burn(uint tokenId) internal override(ERC721, ERC721URIStorage) {
    super._burn(tokenId);
  }

  // @notice tokenURI override
  function tokenURI(uint tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) {
    return super.tokenURI(tokenId);
  }
}

File 2 of 20 : ContractURI.sol
/***
 *     ██████╗ ██████╗ ███╗   ██╗████████╗██████╗  █████╗  ██████╗████████╗    ██╗   ██╗██████╗ ██╗
 *    ██╔════╝██╔═══██╗████╗  ██║╚══██╔══╝██╔══██╗██╔══██╗██╔════╝╚══██╔══╝    ██║   ██║██╔══██╗██║
 *    ██║     ██║   ██║██╔██╗ ██║   ██║   ██████╔╝███████║██║        ██║       ██║   ██║██████╔╝██║
 *    ██║     ██║   ██║██║╚██╗██║   ██║   ██╔══██╗██╔══██║██║        ██║       ██║   ██║██╔══██╗██║
 *    ╚██████╗╚██████╔╝██║ ╚████║   ██║   ██║  ██║██║  ██║╚██████╗   ██║       ╚██████╔╝██║  ██║██║
 *     ╚═════╝ ╚═════╝ ╚═╝  ╚═══╝   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝   ╚═╝        ╚═════╝ ╚═╝  ╚═╝╚═╝
 * Written by MaxFlowO2, Senior Developer and Partner of G&M² Labs
 * Follow me on https://github.com/MaxflowO2 or Twitter @MaxFlowO2
 * email: [email protected]
 *
 * Purpose: OpenSea compliance on chain ID #1-5
 */

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "../interface/IContractURI.sol";

///
/// @dev Implementation of IContractURI.sol
///

abstract contract ContractURI is IContractURI {

  // ERC165
  // contractURI() => 0xe8a3d485
  // IContractURI => 0xe8a3d485

  event ContractURIChange(string _old, string _new);

  string private thisContractURI;

  // @notice this sets the contractURI, set to internal
  // @param newURI - string to URI of Contract Metadata
  //  used for OpenSea and OpenSea-esque Secondary Marketplaces
  function _setContractURI(string memory newURI) internal {
    string memory old = thisContractURI;
    thisContractURI = newURI;
    emit ContractURIChange(old, thisContractURI);
  }

  // @notice contractURI() called for retreval of
  //  OpenSea style collections pages
  // @return - string thisContractURI
  // ERC165 datum contractURI() => 0xe8a3d485
  function contractURI() external view override(IContractURI) returns (string memory) {
    return thisContractURI;
  }

}

File 3 of 20 : IMAX721.sol
/***
 *    ██╗███╗   ██╗████████╗███████╗██████╗ ███████╗ █████╗  ██████╗███████╗
 *    ██║████╗  ██║╚══██╔══╝██╔════╝██╔══██╗██╔════╝██╔══██╗██╔════╝██╔════╝
 *    ██║██╔██╗ ██║   ██║   █████╗  ██████╔╝█████╗  ███████║██║     █████╗  
 *    ██║██║╚██╗██║   ██║   ██╔══╝  ██╔══██╗██╔══╝  ██╔══██║██║     ██╔══╝  
 *    ██║██║ ╚████║   ██║   ███████╗██║  ██║██║     ██║  ██║╚██████╗███████╗
 *    ╚═╝╚═╝  ╚═══╝   ╚═╝   ╚══════╝╚═╝  ╚═╝╚═╝     ╚═╝  ╚═╝ ╚═════╝╚══════╝
 *                                                                          
 *    ███╗   ███╗ █████╗ ██╗  ██╗  ███████╗██████╗  ██╗                     
 *    ████╗ ████║██╔══██╗╚██╗██╔╝  ╚════██║╚════██╗███║                     
 *    ██╔████╔██║███████║ ╚███╔╝█████╗ ██╔╝ █████╔╝╚██║                     
 *    ██║╚██╔╝██║██╔══██║ ██╔██╗╚════╝██╔╝ ██╔═══╝  ██║                     
 *    ██║ ╚═╝ ██║██║  ██║██╔╝ ██╗     ██║  ███████╗ ██║                     
 *    ╚═╝     ╚═╝╚═╝  ╚═╝╚═╝  ╚═╝     ╚═╝  ╚══════╝ ╚═╝                     
 * Written by MaxFlowO2, Senior Developer and Partner of G&M² Labs
 * Follow me on https://github.com/MaxflowO2 or Twitter @MaxFlowO2
 * email: [email protected]
 */

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

///
/// @dev Interface for @MaxFlowO2's Contracts
///  must include or add totalSupply() to main
///

interface IMAX721 is IERC165 {

  // ERC165 data
  // minterStatus() => 0x2ecd28ab
  // minterFees() => 0xd95ae162
  // minterMaximumCapacity() => 0x78c5939b
  // minterMaximumTeamMints() => 0x049157bb
  // minterTeamMintsRemaining() => 0x5c17e370
  // minterTeamMintsCount() => 0xe68b7961
  // totalSupply() => 0x18160ddd
  // IMAX721 => 0x29499a25

  // @notice will return status of Minter
  // @return - bool of active or not
  // ERC165 datum minterStatus() => 0x2ecd28ab
  function minterStatus() external view returns (bool);

  // @notice will return minting fees
  // @return - uint of mint costs in wei
  // ERC165 datum minterFees() => 0xd95ae162
  function minterFees() external view returns (uint);

  // @notice will return maximum mint capacity
  // @return - uint of maximum mints allowed
  // ERC165 datum minterMaximumCapacity() => 0x78c5939b
  function minterMaximumCapacity() external view returns (uint);

  // @notice will return maximum "team minting" capacity
  // @return - uint of maximum airdrops or team mints allowed
  // ERC165 datum minterMaximumTeamMints() => 0x049157bb
  function minterMaximumTeamMints() external view returns (uint);

  // @notice will return "team mints" left
  // @return - uint of remaing airdrops or team mints
  // ERC165 datum minterTeamMintsRemaining() => 0x5c17e370
  function minterTeamMintsRemaining() external view returns (uint);

  // @notice will return "team mints" count
  // @return - uint of airdrops or team mints done
  // ERC165 datum minterTeamMintsCount() => 0xe68b7961
  function minterTeamMintsCount() external view returns (uint);

  // @notice will return current token count
  // @return - uint of how many NFT's minted on contract
  // ERC165 datum totalSupply() => 0x18160ddd
  function totalSupply() external view returns (uint);
}

File 4 of 20 : IContractURI.sol
/***
 *    ██╗ ██████╗ ██████╗ ███╗   ██╗████████╗██████╗  █████╗  ██████╗████████╗    ██╗   ██╗██████╗ ██╗
 *    ██║██╔════╝██╔═══██╗████╗  ██║╚══██╔══╝██╔══██╗██╔══██╗██╔════╝╚══██╔══╝    ██║   ██║██╔══██╗██║
 *    ██║██║     ██║   ██║██╔██╗ ██║   ██║   ██████╔╝███████║██║        ██║       ██║   ██║██████╔╝██║
 *    ██║██║     ██║   ██║██║╚██╗██║   ██║   ██╔══██╗██╔══██║██║        ██║       ██║   ██║██╔══██╗██║
 *    ██║╚██████╗╚██████╔╝██║ ╚████║   ██║   ██║  ██║██║  ██║╚██████╗   ██║       ╚██████╔╝██║  ██║██║
 *    ╚═╝ ╚═════╝ ╚═════╝ ╚═╝  ╚═══╝   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝   ╚═╝        ╚═════╝ ╚═╝  ╚═╝╚═╝
 * Written by MaxFlowO2, Senior Developer and Partner of G&M² Labs
 * Follow me on https://github.com/MaxflowO2 or Twitter @MaxFlowO2
 * email: [email protected]
 *
 * Purpose: OpenSea compliance on chain ID #1-5
 */

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

///
/// @dev Interface for the OpenSea Standard
///

interface IContractURI is IERC165{

  // ERC165
  // contractURI() => 0xe8a3d485
  // IContractURI => 0xe8a3d485

  // @notice contractURI() called for retreval of 
  //  OpenSea style collections pages
  // @return - the string URI of the contract, usually IPFS
  // ERC165 datum contractURI() => 0xe8a3d485
  function contractURI() external view returns (string memory);
}

File 5 of 20 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 6 of 20 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 7 of 20 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

File 8 of 20 : Counters.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 9 of 20 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 10 of 20 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 11 of 20 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 12 of 20 : ERC721URIStorage.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721URIStorage: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

File 13 of 20 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 14 of 20 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

File 15 of 20 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 16 of 20 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 17 of 20 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 18 of 20 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 19 of 20 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 20 of 20 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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ERC20","name":"_old","type":"address"},{"indexed":false,"internalType":"contract ERC20","name":"_new","type":"address"}],"name":"UpdatedERC20Address","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_old","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_new","type":"uint256"}],"name":"UpdatedMintFees","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_old","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_new","type":"uint256"}],"name":"UpdatedMintSize","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"_old","type":"bool"},{"indexed":false,"internalType":"bool","name":"_new","type":"bool"}],"name":"UpdatedMintStatus","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_old","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_new","type":"uint256"}],"name":"UpdatedTeamMintSize","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_old","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_new","type":"uint256"}],"name":"UpdatedThresholdAmount","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_old","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_new","type":"uint256"}],"name":"UpdatedTotalChoices","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"ERC20TokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ERC20TokenName","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ERC20TokenThresholdAmountForClaimNFT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"disableMinting","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"enableMinting","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"hasClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minterFees","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minterMaximumCapacity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minterMaximumTeamMints","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minterStatus","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minterTeamMintsCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minterTeamMintsRemaining","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint2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