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2_deploy_contracts.js

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+var my721 = artifacts.require("my721");
+module.exports = function(deployer){
+	deployer.deploy(my721);
+}

contract721.sol

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+pragma solidity ^0.5.0;
+//import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+
+contract my721 is ERC721{
+
+	mapping(address => uint) tokens;
+
+	function approval(address _owner, address _approved,uint _tokenId){
+		require(tokens[_owner]==_tokenId);
+		tokens[_approved]=_tokenId;
+	}
+	function transfer(address _to, uint _amount) public{
+		require(_amount <= tokens[msg.sender]);
+		tokens[msg.sender]-=_amount;
+		tokens[_to]+=_amount;
+	}
+	function balanceOf(address _owner) public view returns (uint){
+		return tokens[_owner];
+	}
+	function ownerOf(uint _tokenId) public view returns(address){
+		return tokens[_id].address;
+	}
+	function TransferFrom(address _from, address _to, uint _tokenId) payable{
+
+	}
+	function approve(address _approved, uint _tokenId) payable{
+
+	}
+
+	function mint(address _to, uint _id) public{
+		super._mint(_to,_id);
+	}
+