Explains Bytes Code and Init Code

btyesmanager.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;


contract ByteCodeManager {
    function getBytecode(address _owner, uint _foo) public pure returns (bytes memory) {
        bytes memory bytecode = type(TestContract).creationCode;

        return abi.encodePacked(bytecode, abi.encode(_owner, _foo));
    }

    function getInitCode() public pure returns (bytes memory) {
        bytes memory bytecode = type(TestContract).creationCode;
        return bytecode;
    }
}



contract TestContract {
    address public owner;
    uint public foo;

    constructor(address _owner, uint _foo) payable {
        owner = _owner;
        foo = _foo;
    }

    function getBalance() public view returns (uint) {
        return address(this).balance;
    }
}