Demo.sol is a dumb contract, you can run Echo with low gas, forked from https://rinkeby.etherscan.io/address/0x6663184b3521bf1896ba6e1e776ab94c317204b6#code

Demo.sol

/**
 *Submitted for verification at Etherscan.io on 2021-01-27
*/

pragma solidity 0.6;

contract Demo {
    event Echo(string message);

    function echo(string calldata message) external {
        emit Echo(message);
    }
}