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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "./NFTCBase.sol";

/**
 * @title NFT Cult Wrapper Contract
 *
 * ███▄    █   █████▒▄▄▄█████▓    ▄████▄   █    ██  ██▓  ▄▄▄█████▓
 * ██ ▀█   █ ▓██   ▒ ▓  ██▒ ▓▒   ▒██▀ ▀█   ██  ▓██▒▓██▒  ▓  ██▒ ▓▒
 *▓██  ▀█ ██▒▒████ ░ ▒ ▓██░ ▒░   ▒▓█    ▄ ▓██  ▒██░▒██░  ▒ ▓██░ ▒░
 *▓██▒  ▐▌██▒░▓█▒  ░ ░ ▓██▓ ░    ▒▓▓▄ ▄██▒▓▓█  ░██░▒██░  ░ ▓██▓ ░
 *▒██░   ▓██░░▒█░      ▒██▒ ░    ▒ ▓███▀ ░▒▒█████▓ ░██████▒▒██▒ ░
 *░ ▒░   ▒ ▒  ▒ ░      ▒ ░░      ░ ░▒ ▒  ░░▒▓▒ ▒ ▒ ░ ▒░▓  ░▒ ░░
 *░ ░░   ░ ▒░ ░          ░         ░  ▒   ░░▒░ ░ ░ ░ ░ ▒  ░  ░
 *   ░   ░ ░  ░ ░      ░         ░         ░░░ ░ ░   ░ ░   ░
 *         ░                     ░ ░         ░         ░  ░
 *
 * Credit to https://patorjk.com/ for text generator.
 */
contract NFTCult is NFTCBase {
    uint256 private constant MAX_NFT_CULT_MEMBERS = 3333;
    uint256 private constant PRICE_PER_NFT = 0.09 ether;
    string private constant DEFAULT_FLAVOR_URI =
        "Qmd1HmRqqLq4vYUyGNqHHJ2C64H6GcfEKE8KCEjg48Xx3Z/";

    constructor()
        NFTCBase(
            "NFTCult",
            "NFTC",
            "https://gateway.pinata.cloud/ipfs/",
            DEFAULT_FLAVOR_URI,
            13148250,
            MAX_NFT_CULT_MEMBERS,
            PRICE_PER_NFT,
            3,
            true
        )
    {
        // Implementation version: 1
    }

    function _initFlavors(uint256 __numberOfFlavors, bool __lastBitEnabled)
        internal
        virtual
        override
    {
        require(__lastBitEnabled == true, "Unexpected config");

        // Init flavor uris for minting. For clarity, reserve zero val for not using the last bit.
        uint256 idx;
        for (idx = 1; idx <= __numberOfFlavors; idx++) {
            // Some numerical magic here to make the numbers more compatible with forging.
            uint256 flavorIdx = ((idx + 1) * 100) + 1;
            _assignFlavor(flavorIdx, DEFAULT_FLAVOR_URI, false);
            _assignFlavor(flavorIdx + 1, DEFAULT_FLAVOR_URI, false);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title NFTC Contract Base
 * @author @NiftyMike, NFT Culture
 * @notice OpenZeppelin ERC721URIStorage + ERC721Enumerable with some extras.
 * @dev Featuring:
 *      - Extensible Artwork
 *      - Dynamic Forging System
 *      - Burn Minting
 *
 *  About NFT Culture:
 *  NFT Culture is about the intersection of Artists, Collectors and
 *  Marketplaces, with a focus on technology (crypto or otherwise) and
 *  how it can align all three and keep the dynamic of this NFT
 *  movement centered in a way that benefits all of the stakeholders.
 *
 *  Join us in our Discord: https://discord.gg/AhQmvs9Crq
 *
 *  Are you a solidity dev looking for a community? We would love to have
 *  you in the #💾┃tech-and-dev-home channel.
 */
abstract contract NFTCBase is ERC721Enumerable, Ownable, ReentrancyGuard {
    using Counters for Counters.Counter;
    using Strings for uint256;

    event ActionBuy(address indexed _owner, uint256 _id, uint256 count);

    uint256 private constant MAX_MINT_PER_TRANS = 33;
    uint256 private constant MAX_COMBINABLE_TOKENS = 12;

    uint256 public startingBlockNumber;
    uint256 public pricePerNft;
    uint256 public burnMintPricePerNft;
    uint256 public maxNftsForSale;
    uint256 public numberOfFlavors;
    bool public lastBitEnabled;

    string public baseURI;
    string public defaultFlavorURI;

    bool public mintingActive;
    bool public forgingActive;
    bool public burnMintingActive;

    mapping(uint256 => string) private _flavorURIs;
    mapping(uint256 => bool) private _flavorEligibilityMap;

    mapping(uint256 => uint256) private _tokenFlavors;
    mapping(uint256 => address) private _tokenSlotOwners;

    Counters.Counter private _coinMintCounter;

    constructor(
        string memory __name,
        string memory __symbol,
        string memory __baseUri,
        string memory __defaultFlavorUri,
        uint256 __startingBlockNumber,
        uint256 __maxNftsForSale,
        uint256 __pricePerNft,
        uint256 __mintableFlavors,
        bool __lastBitEnabled
    ) ERC721(__name, __symbol) {
        // Metadata config
        baseURI = __baseUri;
        defaultFlavorURI = __defaultFlavorUri;

        // Minting config
        startingBlockNumber = __startingBlockNumber;
        maxNftsForSale = __maxNftsForSale;
        pricePerNft = __pricePerNft;
        burnMintPricePerNft = __pricePerNft;

        // Config for the flavor/forging system.
        numberOfFlavors = __mintableFlavors;
        lastBitEnabled = __lastBitEnabled;

        _initFlavors(numberOfFlavors, lastBitEnabled);
    }

    /**
     * NFTCult tokens contain art featuring the NFTCulture logo, and work
     * done by the NFT Culture community. NFT Culture retains the copyright
     * to NFTCult token artwork, and grants a revokable limited commercial
     * license to active holders of the token. For exact details, see the TOS
     * and License hosted on www.nftculture.com, which is subject to change.
     * Consider this comment public notice of the terms under which these
     * tokens are minted. Accessing this function implies agreement with the
     * terms.
     */
    function mintCultTokens(uint256 count) external payable nonReentrant {
        require(block.number > startingBlockNumber, "Not started");
        require(mintingActive, "Not active");
        require(0 < count && count <= MAX_MINT_PER_TRANS, "Invalid count");
        require(pricePerNft * count == msg.value, "Invalid price");

        _mintCultTokens(_msgSender(), count);
    }

    function burnMintCultToken(uint256 tokenId, uint256 desiredFlavor)
        external
        payable
        nonReentrant
    {
        require(block.number > startingBlockNumber, "Not started");
        require(burnMintingActive, "Not active");
        require(!_exists(tokenId), "Token exists");
        require(_msgSender() == _tokenSlotOwners[tokenId], "Not owner");
        require(burnMintPricePerNft == msg.value, "Invalid price");
        require(
            _flavorEligibilityMap[desiredFlavor] == true,
            "Ineligible flavor"
        );

        _burnMintCultTokens(_msgSender(), tokenId, desiredFlavor);
    }

    function airdropCultTokens(
        address[] memory friends,
        uint256[] memory tokenIds,
        uint256 desiredFlavor
    ) external onlyOwner {
        require(friends.length == tokenIds.length, "Unmatched arrays");
        require(
            _flavorEligibilityMap[desiredFlavor] == true,
            "Ineligible flavor"
        );

        uint256 idx;
        for (idx = 0; idx < friends.length; idx++) {
            require(!_exists(tokenIds[idx]), "Token exists");
            require(
                friends[idx] == _tokenSlotOwners[tokenIds[idx]],
                "Not owner"
            );

            _burnMintCultTokens(friends[idx], tokenIds[idx], desiredFlavor);
        }
    }

    function reserveCultTokens(address[] memory friends, uint256 count)
        external
        onlyOwner
    {
        require(0 < count && count <= MAX_MINT_PER_TRANS, "Invalid count");

        uint256 idx;
        for (idx = 0; idx < friends.length; idx++) {
            _mintCultTokens(friends[idx], count);
        }
    }

    /**
     * Forge tokens together to create new tokens.
     * Note: provided array are the owner's indexes of tokens, NOT tokenIds.
     * EX: Owner owns [ID#55, ID#99, ID#2012]
     * The owner token indexes might be [1, 3, 2] (My point: its unrelated to
     * the ID of the token.)
     */
    function forgeCultTokens(
        uint256[] memory candidateOwnerIndexes,
        uint256 opCode
    ) external nonReentrant {
        require(forgingActive == true, "Forging not active");
        require(
            candidateOwnerIndexes.length < MAX_COMBINABLE_TOKENS,
            "Too many tokens"
        );

        require(opCode == 0 || opCode == 1 || opCode == 2, "Invalid opcode");

        uint256 idx;
        uint256[] memory tokenIdsToForge = new uint256[](
            candidateOwnerIndexes.length
        );

        for (idx = 0; idx < candidateOwnerIndexes.length; idx++) {
            // Validate existence and ownership.
            tokenIdsToForge[idx] = tokenOfOwnerByIndex(
                _msgSender(),
                candidateOwnerIndexes[idx]
            );
        }

        uint256 craftedTokenId = maxNftsForSale + 1;
        uint256 targetFlavor = 0;
        uint256 checkValue = 0;

        for (idx = 0; idx < tokenIdsToForge.length; idx++) {
            uint256 tokenFlavor = _tokenFlavors[tokenIdsToForge[idx]];

            if (opCode == 0) {
                // lateral forge [Must be same flavor]
                if (checkValue == 0) {
                    checkValue = (tokenFlavor / 100) * 100;
                } else {
                    require(
                        checkValue == (tokenFlavor / 100) * 100,
                        "Incompatible flavors"
                    );
                }

                targetFlavor += tokenFlavor % 100;
            } else if (opCode == 1) {
                // vertical forge [Must be same color scheme]
                if (checkValue == 0) {
                    checkValue = tokenFlavor % 100;
                } else {
                    require(
                        checkValue == tokenFlavor % 100,
                        "Incompatible colors"
                    );
                }

                targetFlavor += tokenFlavor / 100;
            } else if (opCode == 2) {
                // multiply forge
                targetFlavor = targetFlavor == 0
                    ? tokenFlavor
                    : targetFlavor * tokenFlavor;
            }

            // Keep track of the lowest id to use for the new mint.
            if (tokenIdsToForge[idx] < craftedTokenId) {
                craftedTokenId = tokenIdsToForge[idx];
            }
        }

        if (opCode == 0) {
            targetFlavor = targetFlavor + checkValue;
        } else if (opCode == 1) {
            targetFlavor = (targetFlavor * 100) + checkValue;
        }

        // Make sure the requested forge target exists.
        require(
            bytes(_flavorURIs[targetFlavor]).length > 0,
            "Forge impossible"
        );

        // Now burn the pieces
        for (idx = 0; idx < tokenIdsToForge.length; idx++) {
            _burn(tokenIdsToForge[idx]);
        }

        // Make sure the slot is now free.
        require(!_exists(craftedTokenId), "Can't re-mint");
        require(craftedTokenId <= maxNftsForSale, "Bad token id");

        // Execute the mint.
        _safeMint(_msgSender(), craftedTokenId);
        _setTokenURI(craftedTokenId, targetFlavor);
    }

    function burnCultToken(uint256 tokenId) external nonReentrant {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId),
            "Not owner or approved"
        );

        _burn(tokenId);
    }

    function setBaseURI(string memory __baseUri) external onlyOwner {
        baseURI = __baseUri;
    }

    // Bulk method to allow one single call to set up the contract.
    function setFlavorURIBulk(
        uint256[] memory flavorIndex,
        string[] memory flavorUri,
        bool[] memory extendedFlavor,
        bool[] memory enableBurnMinting
    ) external onlyOwner {
        require(
            flavorIndex.length == flavorUri.length &&
                flavorIndex.length == extendedFlavor.length &&
                flavorIndex.length == enableBurnMinting.length,
            "Unmatched arrays"
        );

        uint256 idx;
        for (idx = 0; idx < flavorIndex.length; idx++) {
            _setFlavorUri(
                flavorIndex[idx],
                flavorUri[idx],
                extendedFlavor[idx],
                enableBurnMinting[idx]
            );
        }
    }

    function setMintingState(
        bool __mintingActive,
        uint256 __startingBlockNumber,
        bool __forgingActive,
        uint256 __burnMintPricePerNft,
        bool __burnMintingActive
    ) external onlyOwner {
        mintingActive = __mintingActive;

        if (__startingBlockNumber > 0) {
            startingBlockNumber = __startingBlockNumber;
        }

        forgingActive = __forgingActive;

        if (__burnMintPricePerNft > 0) {
            burnMintPricePerNft = __burnMintPricePerNft;
        }

        burnMintingActive = __burnMintingActive;
    }

    /**
     * Special thanks to my friend of 20+ years and business partner
     * Mal, wouldn't have been able to do this without you. - Mike
     *
     * Additionally, thanks to all NFT Culture community members,
     * you guys are awesome, and this has been an incredible journey.
     */
    function withdraw() external onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }

    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        require(_exists(tokenId), "No token");
        string memory base = _baseURI();
        require(bytes(base).length > 0, "Base unset");

        uint256 tokenFlavor = _tokenFlavors[tokenId];

        string memory ipfsUri;
        // If there is no flavor URI, use default uri.
        if (bytes(_flavorURIs[tokenFlavor]).length == 0) {
            ipfsUri = defaultFlavorURI;
        } else {
            ipfsUri = _flavorURIs[tokenFlavor];
        }

        return string(abi.encodePacked(base, ipfsUri, _tokenFilename(tokenId)));
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return baseURI;
    }

    function _tokenFilename(uint256 tokenId)
        internal
        view
        virtual
        returns (string memory)
    {
        uint256 tokenSlot = 10000 + tokenId;
        return tokenSlot.toString();
    }

    function _setTokenURI(uint256 tokenId, uint256 tokenFlavor)
        internal
        virtual
    {
        require(_exists(tokenId), "No token");
        _tokenFlavors[tokenId] = tokenFlavor;
    }

    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (_tokenFlavors[tokenId] > 0) {
            delete _tokenFlavors[tokenId];
        }

        _tokenSlotOwners[tokenId] = _msgSender();
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function _initFlavors(uint256 __numberOfFlavors, bool __lastBitEnabled)
        internal
        virtual
    {
        // Default implementation assumes flavors will be set with write
        // calls to the contract.
    }

    function _assignFlavor(
        uint256 flavorIndex,
        string memory flavorUri,
        bool enableBurnMinting
    ) internal {
        _flavorURIs[flavorIndex] = flavorUri;
        _flavorEligibilityMap[flavorIndex] = enableBurnMinting;
    }

    function _setFlavorUri(
        uint256 flavorIndex,
        string memory flavorUri,
        bool extendedFlavor,
        bool enableBurnMinting
    ) internal {
        // Initially extendedFlavor is a safeguard against overwriting mint
        // config, but ultimately can toggle extendedFlavor as needed to
        // update or create things.
        if (extendedFlavor) {
            require(
                bytes(_flavorURIs[flavorIndex]).length == 0,
                "Cannot overwrite"
            );
        } else {
            require(
                bytes(_flavorURIs[flavorIndex]).length > 0,
                "Flavor not exists"
            );
        }

        _assignFlavor(flavorIndex, flavorUri, enableBurnMinting);
    }

    function _getEntropy(uint256 tokenId, bytes32 __previousBlockHash)
        internal
        view
        virtual
        returns (uint256)
    {
        // Pseudorandom.
        return
            uint256(keccak256(abi.encodePacked(__previousBlockHash, tokenId)));
    }

    // Underscore arguments are being passed in to reduce access to storage variables within the minting loop.
    function _randomFlavorFor(
        uint256 tokenId,
        uint256 __maxNftsForSale,
        uint256 __numberOfFlavors,
        bool __lastBitEnabled,
        bytes32 __previousBlockHash
    ) internal view returns (uint256) {
        require(numberOfFlavors <= 9, "Too many flavors");

        uint256 someEntropy = _getEntropy(tokenId, __previousBlockHash);

        // We need two pseudorandom numbers to pick our selected image,
        // so use the first half and second half of the 256 bit number
        // for this.
        uint256 rightBitSelection = uint128(someEntropy) % __maxNftsForSale;
        uint256 leftBitSelection = uint128(someEntropy >> 128) %
            __maxNftsForSale;

        uint256 theFlavor;
        uint256 lastBit = 0;

        if (__lastBitEnabled) {
            // Distributed uniformly. Start at 200, for forging compatibility.
            theFlavor = ((rightBitSelection % __numberOfFlavors) + 2) * 100;

            // Distributed based on golden ratio.
            lastBit = (leftBitSelection % 100) > 61 ? 2 : 1;
        } else {
            theFlavor = ((rightBitSelection % __numberOfFlavors) + 1) * 100;
        }

        // Combine the two variables into one 3 digit number.
        return theFlavor + lastBit;
    }

    function _mintCultTokens(address minter, uint256 count) internal {
        require(minter != address(0), "Bad address");

        // Save off global references to avoid accessing these when minting multiples.
        uint256 __maxNftsForSale = maxNftsForSale;
        uint256 __numberOfFlavors = numberOfFlavors;
        bool __lastBitEnabled = lastBitEnabled;
        bytes32 __previousBlockHash = blockhash(block.number - 1);

        require(
            _coinMintCounter.current() + count <= __maxNftsForSale,
            "Limit exceeded"
        );

        uint256 idx;
        uint256 tokenId;
        uint256 tokenFlavor;
        for (idx = 0; idx < count; idx++) {
            _coinMintCounter.increment();
            tokenId = _coinMintCounter.current();
            _safeMint(minter, tokenId);

            tokenFlavor = _randomFlavorFor(
                tokenId,
                __maxNftsForSale,
                __numberOfFlavors,
                __lastBitEnabled,
                __previousBlockHash
            );
            
            _setTokenURI(tokenId, tokenFlavor);
        }
    }

    function _burnMintCultTokens(
        address minter,
        uint256 tokenId,
        uint256 desiredFlavor
    ) internal {
        require(minter != address(0), "Bad address");

        _safeMint(minter, tokenId);
        _setTokenURI(tokenId, desiredFlavor);

        delete _tokenSlotOwners[tokenId];
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @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` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * 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 override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// SPDX-License-Identifier: MIT

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 make 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;
    }
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

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 {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_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 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(to).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 {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

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;
}

// SPDX-License-Identifier: MIT

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);
}

// SPDX-License-Identifier: MIT

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);
}

// SPDX-License-Identifier: MIT

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);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private 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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

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);
    }
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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