Create erc721.sol

interoperability/ethereum/erc20/erc721.sol

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+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC721/SafeERC721.sol";
+
+contract ERC721Token {
+    string public name;
+    string public symbol;
+    uint public totalSupply;
+    mapping (address => uint) public balances;
+    mapping (uint => address) public tokenOwners;
+    mapping (uint => string) public tokenURIs;
+
+    constructor(string memory _name, string memory _symbol) public {
+        name = _name;
+        symbol = _symbol;
+    }
+
+    function mint(address _to, uint _tokenId, string memory _tokenURI) public {
+        require(tokenOwners[_tokenId] == address(0), "Token already exists");
+        tokenOwners[_tokenId] = _to;
+        tokenURIs[_tokenId] = _tokenURI;
+        balances[_to]++;
+        totalSupply++;
+        emit Transfer(address(0), _to, _tokenId);
+    }
+
+    function transfer(address _to, uint _tokenId) public {
+        require(tokenOwners[_tokenId] == msg.sender, "Only the owner can transfer");
+        tokenOwners[_tokenId] = _to;
+        balances[msg.sender]--;
+        balances[_to]++;
+        emit Transfer(msg.sender, _to, _tokenId);
+    }
+
+    function ownerOf(uint _tokenId) public view returns (address) {
+        return tokenOwners[_tokenId];
+    }
+
+    function tokenURI(uint _tokenId) public view returns (string memory) {
+        return tokenURIs[_tokenId];
+    }
+
+    event Transfer(address indexed _from, address indexed _to, uint _tokenId);
+}