def handle_command(tokens: list) -> str:

    match tokens:
        case []: return "no command"
        case ["quit"] | ["exit"]: return "quitting"
        case ["help"]: return "showing help"
        case ["go", destination]: return f"going to {destination}"
        case ["go", destination, *_]: return f"going to {destination} with options"
        case _: return "unknown command"