def force_str_end(original_str: str, end: str = "\n") -> str:
    """Make sure a `original_str` ends with `end`.

    Params:
        original_str: String that you want to ensure ending.
        end: String that must exist at the end of `original_str`
    """
    if not original_str.endswith(end):
        return original_str + end
    return original_str