WarningsLowLevelCall.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

contract DeployedContract {
    uint public result = 0;

    function add(uint256 input) public {
        result = result + input;
    }
}

contract Proxy {    
    
    address deployed_contract = 0x1212121212121212121212121212121212121212;

    function lowLevelCall(uint256 lucky_number) public { 
        bytes memory _calldata = abi.encode(bytes4(keccak256("add(uint256)")), lucky_number);
        deployed_contract.call(_calldata);
    }

}