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interface IERC721A interface ERC721A__IERC721Receiver  contract ERC721A is IERC721A    - function name()    - function symbol()    - function _burn(uint256 tokenId)    - function _burn(uint256 tokenId, bool ...  contract YoungPunks is ERC721A *    - function mint(uint256 amount)    - function freeMint(uint256 amount)    - function name()    - function symbol()    - function _baseURI()    - function setUri(string memory _newBas ...    - function contractURI()    - function withdraw()

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/**
 *Submitted for verification at Etherscan.io on 2022-10-06
*/

// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.3
// Creator: Chiru Labs

pragma solidity ^0.8.4;

/**
* @dev Interface of ERC721A.
*/
interface IERC721A {
/**
 * The caller must own the token or be an approved operator.
 */
error ApprovalCallerNotOwnerNorApproved();

/**
 * The token does not exist.
 */
error ApprovalQueryForNonexistentToken();

/**
 * Cannot query the balance for the zero address.
 */
error BalanceQueryForZeroAddress();

/**
 * Cannot mint to the zero address.
 */
error MintToZeroAddress();

/**
 * The quantity of tokens minted must be more than zero.
 */
error MintZeroQuantity();

/**
 * The token does not exist.
 */
error OwnerQueryForNonexistentToken();

/**
 * The caller must own the token or be an approved operator.
 */
error TransferCallerNotOwnerNorApproved();

/**
 * The token must be owned by `from`.
 */
error TransferFromIncorrectOwner();

/**
 * Cannot safely transfer to a contract that does not implement the
 * ERC721Receiver interface.
 */
error TransferToNonERC721ReceiverImplementer();

/**
 * Cannot transfer to the zero address.
 */
error TransferToZeroAddress();

/**
 * The token does not exist.
 */
error URIQueryForNonexistentToken();

/**
 * The `quantity` minted with ERC2309 exceeds the safety limit.
 */
error MintERC2309QuantityExceedsLimit();

/**
 * The `extraData` cannot be set on an unintialized ownership slot.
 */
error OwnershipNotInitializedForExtraData();

// =============================================================
//                            STRUCTS
// =============================================================

struct TokenOwnership {
	// The address of the owner.
	address addr;
	// Stores the start time of ownership with minimal overhead for tokenomics.
	uint64 startTimestamp;
	// Whether the token has been burned.
	bool burned;
	// Arbitrary data similar to `startTimestamp` that can be set via {_extraData}.
	uint24 extraData;
}

// =============================================================
//                         TOKEN COUNTERS
// =============================================================

/**
 * @dev Returns the total number of tokens in existence.
 * Burned tokens will reduce the count.
 * To get the total number of tokens minted, please see {_totalMinted}.
 */
function totalSupply() external view returns (uint256);

// =============================================================
//                            IERC165
// =============================================================

/**
 * @dev Returns true if this contract implements the interface defined by
 * `interfaceId`. See the corresponding
 * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
 * to learn more about how these ids are created.
 *
 * This function call must use less than 30000 gas.
 */
function supportsInterface(bytes4 interfaceId) external view returns (bool);

// =============================================================
//                            IERC721
// =============================================================

/**
 * @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,
	bytes calldata data
) external payable;

/**
 * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
 */
function safeTransferFrom(
	address from,
	address to,
	uint256 tokenId
) external payable;

/**
 * @dev Transfers `tokenId` 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 payable;

/**
 * @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 payable;

/**
 * @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);

// =============================================================
//                        IERC721Metadata
// =============================================================

/**
 * @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);

// =============================================================
//                           IERC2309
// =============================================================

/**
 * @dev Emitted when tokens in `fromTokenId` to `toTokenId`
 * (inclusive) is transferred from `from` to `to`, as defined in the
 * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard.
 *
 * See {_mintERC2309} for more details.
 */
event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to);
}


/**
* @dev Interface of ERC721 token receiver.
*/
interface ERC721A__IERC721Receiver {
function onERC721Received(
	address operator,
	address from,
	uint256 tokenId,
	bytes calldata data
) external returns (bytes4);
}

/**
* @title ERC721A
*
* @dev Implementation of the [ERC721](https://eips.ethereum.org/EIPS/eip-721)
* Non-Fungible Token Standard, including the Metadata extension.
* Optimized for lower gas during batch mints.
*
* Token IDs are minted in sequential order (e.g. 0, 1, 2, 3, ...)
* starting from `_startTokenId()`.
*
* Assumptions:
*
* - An owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
* - The maximum token ID cannot exceed 2**256 - 1 (max value of uint256).
*/

contract ERC721A is IERC721A {
// Bypass for a `--via-ir` bug (https://github.com/chiru-labs/ERC721A/pull/364).
struct TokenApprovalRef {
	address value;
}

// =============================================================
//                           CONSTANTS
// =============================================================

// Mask of an entry in packed address data.
uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;

// The bit position of `numberMinted` in packed address data.
uint256 private constant _BITPOS_NUMBER_MINTED = 64;

// The bit position of `numberBurned` in packed address data.
uint256 private constant _BITPOS_NUMBER_BURNED = 128;

// The bit position of `aux` in packed address data.
uint256 private constant _BITPOS_AUX = 192;

// Mask of all 256 bits in packed address data except the 64 bits for `aux`.
uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;

// The bit position of `startTimestamp` in packed ownership.
uint256 private constant _BITPOS_START_TIMESTAMP = 160;

// The bit mask of the `burned` bit in packed ownership.
uint256 private constant _BITMASK_BURNED = 1 << 224;

// The bit position of the `nextInitialized` bit in packed ownership.
uint256 private constant _BITPOS_NEXT_INITIALIZED = 225;

// The bit mask of the `nextInitialized` bit in packed ownership.
uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225;

// The bit position of `extraData` in packed ownership.
uint256 private constant _BITPOS_EXTRA_DATA = 232;

// Mask of all 256 bits in a packed ownership except the 24 bits for `extraData`.
uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;

// The mask of the lower 160 bits for addresses.
uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;

// The maximum `quantity` that can be minted with {_mintERC2309}.
// This limit is to prevent overflows on the address data entries.
// For a limit of 5000, a total of 3.689e15 calls to {_mintERC2309}
// is required to cause an overflow, which is unrealistic.
uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;

// The `Transfer` event signature is given by:
// `keccak256(bytes("Transfer(address,address,uint256)"))`.
bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
	0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

// =============================================================
//                            STORAGE
// =============================================================

// The next token ID to be minted.
uint256 private _currentIndex;

// The number of tokens burned.
uint256 private _burnCounter;

// Token name
//    string private _name;

// Token symbol
//    string private _symbol;

// Mapping from token ID to ownership details
// An empty struct value does not necessarily mean the token is unowned.
// See {_packedOwnershipOf} implementation for details.
//
// Bits Layout:
// - [0..159]   `addr`
// - [160..223] `startTimestamp`
// - [224]      `burned`
// - [225]      `nextInitialized`
// - [232..255] `extraData`
mapping(uint256 => uint256) private _packedOwnerships;

// Mapping owner address to address data.
//
// Bits Layout:
// - [0..63]    `balance`
// - [64..127]  `numberMinted`
// - [128..191] `numberBurned`
// - [192..255] `aux`
mapping(address => uint256) private _packedAddressData;

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

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

// =============================================================
//                          CONSTRUCTOR
// =============================================================


constructor() {
	_currentIndex = _startTokenId();
}

// =============================================================
//                   TOKEN COUNTING OPERATIONS
// =============================================================

/**
 * @dev Returns the starting token ID.
 * To change the starting token ID, please override this function.
 */
function _startTokenId() internal view virtual returns (uint256) {
	return 1;
}

/**
 * @dev Returns the next token ID to be minted.
 */
function _nextTokenId() internal view virtual returns (uint256) {
	return _currentIndex;
}

/**
 * @dev Returns the total number of tokens in existence.
 * Burned tokens will reduce the count.
 * To get the total number of tokens minted, please see {_totalMinted}.
 */
function totalSupply() public view virtual override returns (uint256) {
	// Counter underflow is impossible as _burnCounter cannot be incremented
	// more than `_currentIndex - _startTokenId()` times.
	unchecked {
		return _currentIndex - _burnCounter - _startTokenId();
	}
}

/**
 * @dev Returns the total amount of tokens minted in the contract.
 */
function _totalMinted() internal view virtual returns (uint256) {
	// Counter underflow is impossible as `_currentIndex` does not decrement,
	// and it is initialized to `_startTokenId()`.
	unchecked {
		return _currentIndex - _startTokenId();
	}
}

/**
 * @dev Returns the total number of tokens burned.
 */
function _totalBurned() internal view virtual returns (uint256) {
	return _burnCounter;
}

// =============================================================
//                    ADDRESS DATA OPERATIONS
// =============================================================

/**
 * @dev Returns the number of tokens in `owner`'s account.
 */
function balanceOf(address owner) public view virtual override returns (uint256) {
	if (owner == address(0)) revert BalanceQueryForZeroAddress();
	return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY;
}

/**
 * Returns the number of tokens minted by `owner`.
 */
function _numberMinted(address owner) internal view returns (uint256) {
	return (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) & _BITMASK_ADDRESS_DATA_ENTRY;
}

/**
 * Returns the number of tokens burned by or on behalf of `owner`.
 */
function _numberBurned(address owner) internal view returns (uint256) {
	return (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) & _BITMASK_ADDRESS_DATA_ENTRY;
}

/**
 * Returns the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
 */
function _getAux(address owner) internal view returns (uint64) {
	return uint64(_packedAddressData[owner] >> _BITPOS_AUX);
}

/**
 * Sets the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
 * If there are multiple variables, please pack them into a uint64.
 */
function _setAux(address owner, uint64 aux) internal virtual {
	uint256 packed = _packedAddressData[owner];
	uint256 auxCasted;
	// Cast `aux` with assembly to avoid redundant masking.
	assembly {
		auxCasted := aux
	}
	packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX);
	_packedAddressData[owner] = packed;
}

// =============================================================
//                            IERC165
// =============================================================

/**
 * @dev Returns true if this contract implements the interface defined by
 * `interfaceId`. See the corresponding
 * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
 * to learn more about how these ids are created.
 *
 * This function call must use less than 30000 gas.
 */
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
	// The interface IDs are constants representing the first 4 bytes
	// of the XOR of all function selectors in the interface.
	// See: [ERC165](https://eips.ethereum.org/EIPS/eip-165)
	// (e.g. `bytes4(i.functionA.selector ^ i.functionB.selector ^ ...)`)
	return
		interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165.
		interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721.
		interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata.
}

// =============================================================
//                        IERC721Metadata
// =============================================================

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


function symbol() public view virtual override returns (string memory) {
	return '';
}



/**
 * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
 */
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
	if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

	string memory baseURI = _baseURI();
	return bytes(baseURI).length != 0 ? string(abi.encodePacked('ipfs://', baseURI, '/', _toString(tokenId), '.json')) : '';
}

/**
 * @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, it can be overridden in child contracts.
 */
function _baseURI() internal view virtual returns (string memory) {
	return '';
}

// =============================================================
//                     OWNERSHIPS OPERATIONS
// =============================================================

/**
 * @dev Returns the owner of the `tokenId` token.
 *
 * Requirements:
 *
 * - `tokenId` must exist.
 */
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
	return address(uint160(_packedOwnershipOf(tokenId)));
}

/**
 * @dev Gas spent here starts off proportional to the maximum mint batch size.
 * It gradually moves to O(1) as tokens get transferred around over time.
 */
function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) {
	return _unpackedOwnership(_packedOwnershipOf(tokenId));
}

/**
 * @dev Returns the unpacked `TokenOwnership` struct at `index`.
 */
function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) {
	return _unpackedOwnership(_packedOwnerships[index]);
}

/**
 * @dev Initializes the ownership slot minted at `index` for efficiency purposes.
 */
function _initializeOwnershipAt(uint256 index) internal virtual {
	if (_packedOwnerships[index] == 0) {
		_packedOwnerships[index] = _packedOwnershipOf(index);
	}
}

/**
 * Returns the packed ownership data of `tokenId`.
 */
function _packedOwnershipOf(uint256 tokenId) private view returns (uint256) {
	uint256 curr = tokenId;

	unchecked {
		if (_startTokenId() <= curr)
			if (curr < _currentIndex) {
				uint256 packed = _packedOwnerships[curr];
				// If not burned.
				if (packed & _BITMASK_BURNED == 0) {
					// Invariant:
					// There will always be an initialized ownership slot
					// (i.e. `ownership.addr != address(0) && ownership.burned == false`)
					// before an unintialized ownership slot
					// (i.e. `ownership.addr == address(0) && ownership.burned == false`)
					// Hence, `curr` will not underflow.
					//
					// We can directly compare the packed value.
					// If the address is zero, packed will be zero.
					while (packed == 0) {
						packed = _packedOwnerships[--curr];
					}
					return packed;
				}
			}
	}
	revert OwnerQueryForNonexistentToken();
}

/**
 * @dev Returns the unpacked `TokenOwnership` struct from `packed`.
 */
function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) {
	ownership.addr = address(uint160(packed));
	ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP);
	ownership.burned = packed & _BITMASK_BURNED != 0;
	ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);
}

/**
 * @dev Packs ownership data into a single uint256.
 */
function _packOwnershipData(address owner, uint256 flags) private view returns (uint256 result) {
	assembly {
		// Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
		owner := and(owner, _BITMASK_ADDRESS)
		// `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`.
		result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags))
	}
}

/**
 * @dev Returns the `nextInitialized` flag set if `quantity` equals 1.
 */
function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) {
	// For branchless setting of the `nextInitialized` flag.
	assembly {
		// `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`.
		result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))
	}
}

// =============================================================
//                      APPROVAL OPERATIONS
// =============================================================

/**
 * @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) public payable virtual override {
	address owner = ownerOf(tokenId);

	if (_msgSenderERC721A() != owner)
		if (!isApprovedForAll(owner, _msgSenderERC721A())) {
			revert ApprovalCallerNotOwnerNorApproved();
		}

	_tokenApprovals[tokenId].value = to;
	emit Approval(owner, to, tokenId);
}

/**
 * @dev Returns the account approved for `tokenId` token.
 *
 * Requirements:
 *
 * - `tokenId` must exist.
 */
function getApproved(uint256 tokenId) public view virtual override returns (address) {
	if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

	return _tokenApprovals[tokenId].value;
}

/**
 * @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) public virtual override {
	_operatorApprovals[_msgSenderERC721A()][operator] = approved;
	emit ApprovalForAll(_msgSenderERC721A(), operator, approved);
}

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

/**
 * @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. See {_mint}.
 */
function _exists(uint256 tokenId) internal view virtual returns (bool) {
	return
		_startTokenId() <= tokenId &&
		tokenId < _currentIndex && // If within bounds,
		_packedOwnerships[tokenId] & _BITMASK_BURNED == 0; // and not burned.
}

/**
 * @dev Returns whether `msgSender` is equal to `approvedAddress` or `owner`.
 */
function _isSenderApprovedOrOwner(
	address approvedAddress,
	address owner,
	address msgSender
) private pure returns (bool result) {
	assembly {
		// Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
		owner := and(owner, _BITMASK_ADDRESS)
		// Mask `msgSender` to the lower 160 bits, in case the upper bits somehow aren't clean.
		msgSender := and(msgSender, _BITMASK_ADDRESS)
		// `msgSender == owner || msgSender == approvedAddress`.
		result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))
	}
}

/**
 * @dev Returns the storage slot and value for the approved address of `tokenId`.
 */
function _getApprovedSlotAndAddress(uint256 tokenId)
	private
	view
	returns (uint256 approvedAddressSlot, address approvedAddress)
{
	TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];
	// The following is equivalent to `approvedAddress = _tokenApprovals[tokenId].value`.
	assembly {
		approvedAddressSlot := tokenApproval.slot
		approvedAddress := sload(approvedAddressSlot)
	}
}

// =============================================================
//                      TRANSFER OPERATIONS
// =============================================================

/**
 * @dev Transfers `tokenId` from `from` to `to`.
 *
 * 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
) public payable virtual override {
	uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);

	if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner();

	(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);

	// The nested ifs save around 20+ gas over a compound boolean condition.
	if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
		if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();

	if (to == address(0)) revert TransferToZeroAddress();

	_beforeTokenTransfers(from, to, tokenId, 1);

	// Clear approvals from the previous owner.
	assembly {
		if approvedAddress {
			// This is equivalent to `delete _tokenApprovals[tokenId]`.
			sstore(approvedAddressSlot, 0)
		}
	}

	// Underflow of the sender's balance is impossible because we check for
	// ownership above and the recipient's balance can't realistically overflow.
	// Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
	unchecked {
		// We can directly increment and decrement the balances.
		--_packedAddressData[from]; // Updates: `balance -= 1`.
		++_packedAddressData[to]; // Updates: `balance += 1`.

		// Updates:
		// - `address` to the next owner.
		// - `startTimestamp` to the timestamp of transfering.
		// - `burned` to `false`.
		// - `nextInitialized` to `true`.
		_packedOwnerships[tokenId] = _packOwnershipData(
			to,
			_BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked)
		);

		// If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
		if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
			uint256 nextTokenId = tokenId + 1;
			// If the next slot's address is zero and not burned (i.e. packed value is zero).
			if (_packedOwnerships[nextTokenId] == 0) {
				// If the next slot is within bounds.
				if (nextTokenId != _currentIndex) {
					// Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
					_packedOwnerships[nextTokenId] = prevOwnershipPacked;
				}
			}
		}
	}

	emit Transfer(from, to, tokenId);
	_afterTokenTransfers(from, to, tokenId, 1);
}

/**
 * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
 */
function safeTransferFrom(
	address from,
	address to,
	uint256 tokenId
) public payable virtual override {
	safeTransferFrom(from, to, tokenId, '');
}

/**
 * @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 memory _data
) public payable virtual override {
	transferFrom(from, to, tokenId);
	if (to.code.length != 0)
		if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {
			revert TransferToNonERC721ReceiverImplementer();
		}
}

/**
 * @dev Hook that is called before a set of serially-ordered token IDs
 * are about to be transferred. This includes minting.
 * And also called before burning one token.
 *
 * `startTokenId` - the first token ID to be transferred.
 * `quantity` - the amount to be transferred.
 *
 * 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, `tokenId` will be burned by `from`.
 * - `from` and `to` are never both zero.
 */
function _beforeTokenTransfers(
	address from,
	address to,
	uint256 startTokenId,
	uint256 quantity
) internal virtual {}

/**
 * @dev Hook that is called after a set of serially-ordered token IDs
 * have been transferred. This includes minting.
 * And also called after one token has been burned.
 *
 * `startTokenId` - the first token ID to be transferred.
 * `quantity` - the amount to be transferred.
 *
 * Calling conditions:
 *
 * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
 * transferred to `to`.
 * - When `from` is zero, `tokenId` has been minted for `to`.
 * - When `to` is zero, `tokenId` has been burned by `from`.
 * - `from` and `to` are never both zero.
 */
function _afterTokenTransfers(
	address from,
	address to,
	uint256 startTokenId,
	uint256 quantity
) internal virtual {}

/**
 * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target contract.
 *
 * `from` - Previous owner of the given token ID.
 * `to` - Target address that will receive the token.
 * `tokenId` - Token ID to be transferred.
 * `_data` - Optional data to send along with the call.
 *
 * Returns whether the call correctly returned the expected magic value.
 */
function _checkContractOnERC721Received(
	address from,
	address to,
	uint256 tokenId,
	bytes memory _data
) private returns (bool) {
	try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns (
		bytes4 retval
	) {
		return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector;
	} catch (bytes memory reason) {
		if (reason.length == 0) {
			revert TransferToNonERC721ReceiverImplementer();
		} else {
			assembly {
				revert(add(32, reason), mload(reason))
			}
		}
	}
}

// =============================================================
//                        MINT OPERATIONS
// =============================================================

/**
 * @dev Mints `quantity` tokens and transfers them to `to`.
 *
 * Requirements:
 *
 * - `to` cannot be the zero address.
 * - `quantity` must be greater than 0.
 *
 * Emits a {Transfer} event for each mint.
 */
function _mint(address to, uint256 quantity) internal virtual {
	uint256 startTokenId = _currentIndex;
	if (quantity == 0) revert MintZeroQuantity();

	_beforeTokenTransfers(address(0), to, startTokenId, quantity);

	// Overflows are incredibly unrealistic.
	// `balance` and `numberMinted` have a maximum limit of 2**64.
	// `tokenId` has a maximum limit of 2**256.
	unchecked {
		// Updates:
		// - `balance += quantity`.
		// - `numberMinted += quantity`.
		//
		// We can directly add to the `balance` and `numberMinted`.
		_packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);

		// Updates:
		// - `address` to the owner.
		// - `startTimestamp` to the timestamp of minting.
		// - `burned` to `false`.
		// - `nextInitialized` to `quantity == 1`.
		_packedOwnerships[startTokenId] = _packOwnershipData(
			to,
			_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
		);

		uint256 toMasked;
		uint256 end = startTokenId + quantity;

		// Use assembly to loop and emit the `Transfer` event for gas savings.
		// The duplicated `log4` removes an extra check and reduces stack juggling.
		// The assembly, together with the surrounding Solidity code, have been
		// delicately arranged to nudge the compiler into producing optimized opcodes.
		assembly {
			// Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean.
			toMasked := and(to, _BITMASK_ADDRESS)
			// Emit the `Transfer` event.
			log4(
				0, // Start of data (0, since no data).
				0, // End of data (0, since no data).
				_TRANSFER_EVENT_SIGNATURE, // Signature.
				0, // `address(0)`.
				toMasked, // `to`.
				startTokenId // `tokenId`.
			)

			// The `iszero(eq(,))` check ensures that large values of `quantity`
			// that overflows uint256 will make the loop run out of gas.
			// The compiler will optimize the `iszero` away for performance.
			for {
				let tokenId := add(startTokenId, 1)
			} iszero(eq(tokenId, end)) {
				tokenId := add(tokenId, 1)
			} {
				// Emit the `Transfer` event. Similar to above.
				log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)
			}
		}
		if (toMasked == 0) revert MintToZeroAddress();

		_currentIndex = end;
	}
	_afterTokenTransfers(address(0), to, startTokenId, quantity);
}

/**
 * @dev Mints `quantity` tokens and transfers them to `to`.
 *
 * This function is intended for efficient minting only during contract creation.
 *
 * It emits only one {ConsecutiveTransfer} as defined in
 * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309),
 * instead of a sequence of {Transfer} event(s).
 *
 * Calling this function outside of contract creation WILL make your contract
 * non-compliant with the ERC721 standard.
 * For full ERC721 compliance, substituting ERC721 {Transfer} event(s) with the ERC2309
 * {ConsecutiveTransfer} event is only permissible during contract creation.
 *
 * Requirements:
 *
 * - `to` cannot be the zero address.
 * - `quantity` must be greater than 0.
 *
 * Emits a {ConsecutiveTransfer} event.
 */
function _mintERC2309(address to, uint256 quantity) internal virtual {
	uint256 startTokenId = _currentIndex;
	if (to == address(0)) revert MintToZeroAddress();
	if (quantity == 0) revert MintZeroQuantity();
	if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) revert MintERC2309QuantityExceedsLimit();

	_beforeTokenTransfers(address(0), to, startTokenId, quantity);

	// Overflows are unrealistic due to the above check for `quantity` to be below the limit.
	unchecked {
		// Updates:
		// - `balance += quantity`.
		// - `numberMinted += quantity`.
		//
		// We can directly add to the `balance` and `numberMinted`.
		_packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);

		// Updates:
		// - `address` to the owner.
		// - `startTimestamp` to the timestamp of minting.
		// - `burned` to `false`.
		// - `nextInitialized` to `quantity == 1`.
		_packedOwnerships[startTokenId] = _packOwnershipData(
			to,
			_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
		);

		emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to);

		_currentIndex = startTokenId + quantity;
	}
	_afterTokenTransfers(address(0), to, startTokenId, quantity);
}

/**
 * @dev Safely mints `quantity` tokens and transfers them to `to`.
 *
 * Requirements:
 *
 * - If `to` refers to a smart contract, it must implement
 * {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
 * - `quantity` must be greater than 0.
 *
 * See {_mint}.
 *
 * Emits a {Transfer} event for each mint.
 */
function _safeMint(
	address to,
	uint256 quantity,
	bytes memory _data
) internal virtual {
	_mint(to, quantity);

	unchecked {
		if (to.code.length != 0) {
			uint256 end = _currentIndex;
			uint256 index = end - quantity;
			do {
				if (!_checkContractOnERC721Received(address(0), to, index++, _data)) {
					revert TransferToNonERC721ReceiverImplementer();
				}
			} while (index < end);
			// Reentrancy protection.
			if (_currentIndex != end) revert();
		}
	}
}

/**
 * @dev Equivalent to `_safeMint(to, quantity, '')`.
 */
function _safeMint(address to, uint256 quantity) internal virtual {
	_safeMint(to, quantity, '');
}

// =============================================================
//                        BURN OPERATIONS
// =============================================================


function _burn(uint256 tokenId) internal virtual {
	_burn(tokenId, false);
}

function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
	uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);

	address from = address(uint160(prevOwnershipPacked));

	(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);

	if (approvalCheck) {
		// The nested ifs save around 20+ gas over a compound boolean condition.
		if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
			if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();
	}

	_beforeTokenTransfers(from, address(0), tokenId, 1);

	// Clear approvals from the previous owner.
	assembly {
		if approvedAddress {
			// This is equivalent to `delete _tokenApprovals[tokenId]`.
			sstore(approvedAddressSlot, 0)
		}
	}

	// Underflow of the sender's balance is impossible because we check for
	// ownership above and the recipient's balance can't realistically overflow.
	// Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
	unchecked {
		// Updates:
		// - `balance -= 1`.
		// - `numberBurned += 1`.
		//
		// We can directly decrement the balance, and increment the number burned.
		// This is equivalent to `packed -= 1; packed += 1 << _BITPOS_NUMBER_BURNED;`.
		_packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1;

		// Updates:
		// - `address` to the last owner.
		// - `startTimestamp` to the timestamp of burning.
		// - `burned` to `true`.
		// - `nextInitialized` to `true`.
		_packedOwnerships[tokenId] = _packOwnershipData(
			from,
			(_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) | _nextExtraData(from, address(0), prevOwnershipPacked)
		);

		// If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
		if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
			uint256 nextTokenId = tokenId + 1;
			// If the next slot's address is zero and not burned (i.e. packed value is zero).
			if (_packedOwnerships[nextTokenId] == 0) {
				// If the next slot is within bounds.
				if (nextTokenId != _currentIndex) {
					// Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
					_packedOwnerships[nextTokenId] = prevOwnershipPacked;
				}
			}
		}
	}

	emit Transfer(from, address(0), tokenId);
	_afterTokenTransfers(from, address(0), tokenId, 1);

	// Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
	unchecked {
		_burnCounter++;
	}
}


// =============================================================
//                     EXTRA DATA OPERATIONS
// =============================================================

/**
 * @dev Directly sets the extra data for the ownership data `index`.
 */
function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {
	uint256 packed = _packedOwnerships[index];
	if (packed == 0) revert OwnershipNotInitializedForExtraData();
	uint256 extraDataCasted;
	// Cast `extraData` with assembly to avoid redundant masking.
	assembly {
		extraDataCasted := extraData
	}
	packed = (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) | (extraDataCasted << _BITPOS_EXTRA_DATA);
	_packedOwnerships[index] = packed;
}

/**
 * @dev Called during each token transfer to set the 24bit `extraData` field.
 * Intended to be overridden by the cosumer contract.
 *
 * `previousExtraData` - the value of `extraData` before transfer.
 *
 * 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, `tokenId` will be burned by `from`.
 * - `from` and `to` are never both zero.
 */
function _extraData(
	address from,
	address to,
	uint24 previousExtraData
) internal view virtual returns (uint24) {}

/**
 * @dev Returns the next extra data for the packed ownership data.
 * The returned result is shifted into position.
 */
function _nextExtraData(
	address from,
	address to,
	uint256 prevOwnershipPacked
) private view returns (uint256) {
	uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);
	return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;
}

// =============================================================
//                       OTHER OPERATIONS
// =============================================================

/**
 * @dev Returns the message sender (defaults to `msg.sender`).
 *
 * If you are writing GSN compatible contracts, you need to override this function.
 */
function _msgSenderERC721A() internal view virtual returns (address) {
	return msg.sender;
}

/**
 * @dev Converts a uint256 to its ASCII string decimal representation.
 */
function _toString(uint256 value) internal pure virtual returns (string memory str) {
	assembly {
		// The maximum value of a uint256 contains 78 digits (1 byte per digit), but
		// we allocate 0xa0 bytes to keep the free memory pointer 32-byte word aligned.
		// We will need 1 word for the trailing zeros padding, 1 word for the length,
		// and 3 words for a maximum of 78 digits. Total: 5 * 0x20 = 0xa0.
		let m := add(mload(0x40), 0xa0)
		// Update the free memory pointer to allocate.
		mstore(0x40, m)
		// Assign the `str` to the end.
		str := sub(m, 0x20)
		// Zeroize the slot after the string.
		mstore(str, 0)

		// Cache the end of the memory to calculate the length later.
		let end := str

		// We write the string from rightmost digit to leftmost digit.
		// The following is essentially a do-while loop that also handles the zero case.
		// prettier-ignore
		for { let temp := value } 1 {} {
			str := sub(str, 1)
			// Write the character to the pointer.
			// The ASCII index of the '0' character is 48.
			mstore8(str, add(48, mod(temp, 10)))
			// Keep dividing `temp` until zero.
			temp := div(temp, 10)
			// prettier-ignore
			if iszero(temp) { break }
		}

		let length := sub(end, str)
		// Move the pointer 32 bytes leftwards to make room for the length.
		str := sub(str, 0x20)
		// Store the length.
		mstore(str, length)
	}
}
}

contract YoungPunks is ERC721A{
address private immutable _owner;

modifier onlyOwner() { 
	require(_owner==msg.sender, "not owner");
	_; 
}

uint256 public constant MAX_SUPPLY = 10000;
uint256 public constant MAX_FREE = 9000;
uint256 public constant MAX_FREE_PER_WALLET = 3;
uint256 public constant COST = 0.001 ether;

string private __baseUri = "a";
string private __contractUri = "b";

constructor() ERC721A(){
	_owner = msg.sender;
	//_mintERC2309(msg.sender, 10);
}

function mint(uint256 amount) external payable{
	require(totalSupply() + amount <= MAX_SUPPLY, "Sold Out");
	require(amount*COST <= msg.value, "Value to Low");
	
	_safeMint(msg.sender, amount);
}

function freeMint(uint256 amount) external{
	require(totalSupply() + amount <= MAX_SUPPLY, "Sold Out");
	require(amount + _numberMinted(msg.sender) <= MAX_FREE_PER_WALLET, "Max per Wallet");
	
	_safeMint(msg.sender, amount);
}

function name() public view virtual override returns (string memory) {
	return "Young Punks";
}

function symbol() public view virtual override returns (string memory) {
	return "YOPU";
}

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

function setUri(string memory _newBase, string memory _newContract) external onlyOwner{
	__baseUri = _newBase;
	__contractUri = _newContract;
}

function contractURI() public view returns (string memory) {
	return string(abi.encodePacked("ipfs://", __contractUri));
} 

function withdraw() external onlyOwner {
	uint256 balance = address(this).balance;
	payable(msg.sender).transfer(balance);
}
}

• No Contract Security Audit Submitted- Submit Audit Here

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