def joinDockerInstruction(input_instruction: str, input_params: list[str]) -> str:
    """
    Reverse operation to splitDockerInstruction

    :param input_instruction: docker instruction, e.g. FROM
    :param input_params: list of parameters, e.g. [ubuntu]
    :return: string representation of a docker instruction, e.g. FROM ubuntu
    """
    return f"{input_instruction} {' '.join(input_params)}"