re-entrancy project

_safeMint.md

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"
       );
   }