14.sol

// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

contract MyContract{
    mapping (uint => string) public myMapping;

    function get(uint _id) public view returns (string memory)
    {
        return myMapping[_id];
    }
    function set(uint _id, string memory _value) public {
        myMapping[_id] = _value;
    }
    function remove(uint _id) public {
        delete myMapping[_id];
    }
}