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pragma solidity ^0.6.0;

import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC721/ERC721.sol";

// ERC-721 contract that represents unique, non-fungible tokens
contract MyERC721 is ERC721 {
    // The base URI is a human-readable string that is used as the base URL
    // for all token URIs
    string private _baseURI;

constructor(string memory _name, string memory _symbol, string memory _baseURI)
        ERC721(_name, _symbol)
        public
    {
        // Set the base URI
        _setBaseURI(_baseURI);
    }

// Set the base URI for the contract
    function setBaseURI(string memory _baseURI) public {
        // Only the contract owner can set the base URI
        require(msg.sender == owner, "Only the contract owner can set the base URI");

// Set the base URI
        _setBaseURI(_baseURI);
    }

// Internal function to set the base URI
    function _setBaseURI(string memory _baseURI) internal {
        // Set the base URI
        _baseURI = _baseURI;
    }

// Returns the base URI for the contract
    function baseURI() public view returns (string memory) {
        return _baseURI;
    }

// Returns the token URI for a given token ID
    function tokenURI(uint256 _tokenId) public view virtual override returns (string memory) {
        // Encode the token URI according to the ERC-721 specification
        // The token URI should be a human-readable string that uniquely identifies the token
        return _baseURI + _tokenId;
    }
}
pragma solidity ^0.7.0;

import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC721/ERC721.sol";

contract MyToken is ERC721 {
  // The base URI for the token contract
  string private baseURI;

/**
   * @dev Sets the base URI for the token contract
   * @param _baseURI The base URI to set for the contract
   */
  function _setBaseURI(string memory _baseURI) internal {
    // Only the contract owner can set the base URI
    require(msg.sender == owner, "Only the contract owner can set the base URI");

// Set the base URI
    baseURI = _baseURI;
  }

/**
   * @dev Returns the base URI set for the token contract
   * @return The base URI set for the contract
   */
  function getBaseURI() public view returns (string memory) {
    return baseURI;
  }
}