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contracts...strings.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8;

contract _string{

    string public str= "gateway";  //state variable

    //constant keyword variable charge lower gas than other variable
    address public constant ownerAddress = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4;  //lower gas cost

    address public ownerAddr = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4; //higher gas cost

  

    function checkString(string memory _str) public pure returns(string memory){
        string memory name = _str;  //local variable
        return name;
    }
}