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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

interface INFT {
    function walletOfOwner(address _owner) external view returns (uint256[] memory);
}

contract COSMIC is ERC20, ERC721Holder, Ownable {


    address public nft;
    address public martianNft;

    ERC20 private oldToken;

    mapping(uint256 => address) public tokenOwnerOf; // owner of token id
    mapping(uint256 => uint256) public tokenStakedAt; // staked at what timestamp

    mapping(uint256 => address) public tokenOwnerOfMartian; // owner of token id
    mapping(uint256 => uint256) public tokenStakedAtMartian; // staked at what timestamp

    uint256 public EMISSION_RATE = (1 * 10 ** decimals()) / 1 days;
    uint256 public MARTIAN_EMISSION_RATE = (1 * 10 ** decimals()) / 1 days;

    // Constructor
    constructor(address _oldToken, address _nft, address _martianNft) ERC20("COSMIC v2", "COSMIC"){
        oldToken = ERC20(_oldToken);
        nft = _nft;
        martianNft = _martianNft;
        _mint(msg.sender, 100000 * 10 ** decimals());
    }

    // Fuction to Set NFT Contract
    function updateNftContract(address _nft, address _martianNft) public onlyOwner {
        nft = _nft;
        martianNft = _martianNft;
    }

    // Additional token minting by owner
    function additionalMinting(uint256 _amount) public onlyOwner {
        _mint(msg.sender, _amount);
    }

    // Change emission rate for martian nft
    function changeRewardsMartian(uint256 _rate) external onlyOwner {
        MARTIAN_EMISSION_RATE = (_rate * 10 ** decimals()) / 1 days;
    }

    // Change emission rate for GEX NFT
    function changeRewards(uint256 _rate) external onlyOwner {
        EMISSION_RATE = (_rate * 10 ** decimals()) / 1 days;
    }

    // Stake Function
    function stake(uint256 tokenId) external {
        IERC721(nft).safeTransferFrom(msg.sender, address(this), tokenId);
        tokenOwnerOf[tokenId] = msg.sender;
        tokenStakedAt[tokenId] = block.timestamp;
    }

    // Calculate Staked Tokens for a Specific NFT
    function calculateTokens(uint256 tokenId) public view returns (uint256) {
        require(tokenStakedAt[tokenId] > 0, "Token Not Staked");
        uint256 timeElapsed = block.timestamp - tokenStakedAt[tokenId];
        return timeElapsed * EMISSION_RATE;
    }

    // Unstake Function
    function unstake(uint256 tokenId) external {
        require(tokenOwnerOf[tokenId] == msg.sender, "You can't unstake");
        _mint(msg.sender, calculateTokens(tokenId)); // Minting the tokens for staking
        IERC721(nft).transferFrom(address(this), msg.sender, tokenId);
        delete tokenOwnerOf[tokenId];
        delete tokenStakedAt[tokenId];
    }

    // Batch Staking of NFTs Function
    function batchStake(uint256[] memory tokenId) external returns (bool status){
        uint256 len = tokenId.length;
        for(uint256 i=0 ; i<len; i++){
            IERC721(nft).safeTransferFrom(msg.sender, address(this), tokenId[i]);
            tokenOwnerOf[tokenId[i]] = msg.sender;
            tokenStakedAt[tokenId[i]] = block.timestamp;
        }
        return true;
    }

    // Batch Unstaking of NFTs Function
    function batchUnstake(uint256[] memory tokenId) external checkStake(tokenId) returns (bool status){
        _mint(msg.sender, batchCalculateTokens(tokenId)); // Minting the tokens for staking
        for(uint256 i=0 ; i<tokenId.length; i++){
            IERC721(nft).transferFrom(address(this), msg.sender, tokenId[i]);
            delete tokenOwnerOf[tokenId[i]];
            delete tokenStakedAt[tokenId[i]];
        }
        return true;
    }

    // Calculate total tokens of all NFTs to unstake function
    function batchCalculateTokens(uint256[] memory tokenId) public view returns (uint256) {
        uint256 totalToken;
        for(uint256 i=0 ; i<tokenId.length; i++){
            if(tokenStakedAt[tokenId[i]] > 0){
                uint256 timeElapsed = block.timestamp - tokenStakedAt[tokenId[i]];
                totalToken += timeElapsed * EMISSION_RATE;
            }  
        }        
        return totalToken;
    }

    // Exchange old token with new token function
    function exchangeToken() external {
        uint256 amount = oldToken.balanceOf(msg.sender);
        require(amount > 0, "Insufficient balance to withdraw");
        _mint(msg.sender, amount);
        oldToken.transferFrom(msg.sender,0x000000000000000000000000000000000000dEaD, amount);
    }

    //show yield of a user function
    function showYield(address user) public view returns(uint256) {
        uint[] memory tokenIds = getTokensOwnedByUser(user);
        if (tokenIds.length > 0){
            return batchCalculateTokens(tokenIds);
        }
        return 0;        
    }

    // withdraw yield without unstaking nft function
    function withdrawYield(address user) external returns(uint256) {
        require(user == msg.sender, "You can't withdraw tokens");
        uint[] memory tokenIds = getTokensOwnedByUser(user);
        uint256 totalToken;
        for(uint256 i=0; i<tokenIds.length ; i++){
            if(tokenStakedAt[tokenIds[i]] > 0){
                uint256 timeElapsed = block.timestamp - tokenStakedAt[tokenIds[i]];
                totalToken += timeElapsed * EMISSION_RATE;
                tokenStakedAt[tokenIds[i]] = block.timestamp;
            }
        }
        _mint(msg.sender, totalToken);
        return totalToken;
    }

    // Show Staked NFTs
    function getTokensOwnedByUser(address user) public view returns(uint[] memory){
        uint256[] memory tokenStaked = INFT(nft).walletOfOwner(address(this));
        uint256[] memory tokenOwnedByUser = new uint256[](tokenStaked.length);
        uint256 currentIndex = 0;

        for (uint i; i < tokenStaked.length;){
            if(user == tokenOwnerOf[tokenStaked[i]]){
                tokenOwnedByUser[currentIndex] = tokenStaked[i];
                currentIndex++;
            }
            unchecked {++i;}
        }

        return tokenOwnedByUser;
    }

    modifier checkStake(uint256[] memory tokenId){
        for(uint256 i=0 ; i<tokenId.length; i++){
            require(tokenOwnerOf[tokenId[i]] == msg.sender, "You can't unstake");
        }
        _;
    }


    //Martian contract------------------------------------------------------------------------------------ 


    function stakeMartian(uint256 tokenId) external {
        IERC721(martianNft).safeTransferFrom(msg.sender, address(this), tokenId);
        tokenOwnerOfMartian[tokenId] = msg.sender;
        tokenStakedAtMartian[tokenId] = block.timestamp;
    }

    // Calculate Staked Tokens for a Specific martianNft
    function calculateTokensMartian(uint256 tokenId) public view returns (uint256) {
        require(tokenStakedAtMartian[tokenId] > 0, "Token Not Staked");
        uint256 timeElapsed = block.timestamp - tokenStakedAtMartian[tokenId];
        return timeElapsed * MARTIAN_EMISSION_RATE;
    }

    // Unstake Function
    function unstakeMartian(uint256 tokenId) external {
        require(tokenOwnerOfMartian[tokenId] == msg.sender, "You can't unstake");
        _mint(msg.sender, calculateTokensMartian(tokenId)); // Minting the tokens for staking
        IERC721(martianNft).transferFrom(address(this), msg.sender, tokenId);
        delete tokenOwnerOfMartian[tokenId];
        delete tokenStakedAtMartian[tokenId];
    }

    // Batch Staking of martianNfts Function
    function batchStakeMartian(uint256[] memory tokenId) external returns (bool status){
        uint256 len = tokenId.length;
        for(uint256 i=0 ; i<len; i++){
            IERC721(martianNft).safeTransferFrom(msg.sender, address(this), tokenId[i]);
            tokenOwnerOfMartian[tokenId[i]] = msg.sender;
            tokenStakedAtMartian[tokenId[i]] = block.timestamp;
        }
        return true;
    }

    // Batch Unstaking of martianNfts Function
    function batchUnstakeMartian(uint256[] memory tokenId) external checkStakeMartian(tokenId) returns (bool status){
        _mint(msg.sender, batchCalculateTokensMartian(tokenId)); // Minting the tokens for staking
        for(uint256 i=0 ; i<tokenId.length; i++){
            IERC721(martianNft).transferFrom(address(this), msg.sender, tokenId[i]);
            delete tokenOwnerOfMartian[tokenId[i]];
            delete tokenStakedAtMartian[tokenId[i]];
        }
        return true;
    }

    // Calculate total tokens of all martianNfts to unstake function
    function batchCalculateTokensMartian(uint256[] memory tokenId) public view returns (uint256) {
        uint256 totalToken;
        for(uint256 i=0 ; i<tokenId.length; i++){
            if(tokenStakedAtMartian[tokenId[i]] > 0){
                uint256 timeElapsed = block.timestamp - tokenStakedAtMartian[tokenId[i]];
                totalToken += timeElapsed * MARTIAN_EMISSION_RATE;
            }  
        }        
        return totalToken;
    }

        //show yield of a user function
    function showYieldMartian(address user) public view returns(uint256) {
        uint[] memory tokenIds = getTokensOwnedByUserMartian(user);
        if (tokenIds.length > 0){
            return batchCalculateTokensMartian(tokenIds);
        }
        return 0;        
    }

    // withdraw yield without unstaking martianNft function
    function withdrawYieldMartian(address user) external returns(uint256) {
        require(user == msg.sender, "You can't withdraw tokens");
        uint[] memory tokenIds = getTokensOwnedByUserMartian(user);
        uint256 totalToken;
        for(uint256 i=0; i<tokenIds.length ; i++){
            if(tokenStakedAtMartian[tokenIds[i]] > 0){
                uint256 timeElapsed = block.timestamp - tokenStakedAtMartian[tokenIds[i]];
                totalToken += timeElapsed * MARTIAN_EMISSION_RATE;
                tokenStakedAtMartian[tokenIds[i]] = block.timestamp;
            }
        }
        _mint(msg.sender, totalToken);
        return totalToken;
    }

    // Show Staked martianNfts
    function getTokensOwnedByUserMartian(address user) public view returns(uint[] memory){
        uint256[] memory tokenOwnedByUser = new uint256[](1112);
        uint256 currentIndex = 0;

        for(uint256 i=0; i < 1112; i++){
            if(user == tokenOwnerOfMartian[i]){
                tokenOwnedByUser[currentIndex] = i;
                currentIndex++;
            }
        }
        uint256[] memory tokenOwnedByUserFinal = new uint256[](currentIndex);

        for(uint256 i=0; i<currentIndex; i++){
            tokenOwnedByUserFinal[i] = tokenOwnedByUser[i];
        }
        return tokenOwnedByUserFinal;
    }

    modifier checkStakeMartian(uint256[] memory tokenId){
        for(uint256 i=0 ; i<tokenId.length; i++){
            require(tokenOwnerOfMartian[tokenId[i]] == msg.sender, "You can't unstake");
        }
        _;
    }


}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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`.
     *
     * 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;

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

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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 {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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ateMutability":"nonpayable","type":"function"}]

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0000000000000000000000000388fd621505eccc4ed6009ded6bcc107195f11e0000000000000000000000003f7e4b1ebe37788a941dc095ed56c8ab2bb2d4020000000000000000000000004af5658577a117c73eb16559f4ca39fe5d7aaeb6

-----Decoded View---------------
Arg [0] : _oldToken (address): 0x0388Fd621505ECCC4Ed6009dED6bcC107195f11E
Arg [1] : _nft (address): 0x3F7E4B1EbE37788A941dC095ed56C8ab2bb2d402
Arg [2] : _martianNft (address): 0x4Af5658577A117C73eB16559F4cA39fe5D7AaeB6

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000000388fd621505eccc4ed6009ded6bcc107195f11e
Arg [1] : 0000000000000000000000003f7e4b1ebe37788a941dc095ed56c8ab2bb2d402
Arg [2] : 0000000000000000000000004af5658577a117c73eb16559f4ca39fe5d7aaeb6