def timeit_command(function_setup, function_call):
    """Build command suitable for the CLI of the timeit module."""
    if function_setup is None:
        function_setup = []
    if function_call is None:
        raise ValueError('no function defined for the Timeit module to run')

    setup = [item for setup in function_setup for item in ['-s', setup]]
    command = ['python3', '-m', 'timeit'] + setup + [function_call]
    return command