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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _make_pretty_arguments(arguments):
 """ Makes the arguments description pretty and returns a formatted string if `arguments` starts with the argument prefix. Otherwise, returns None. Expected input: Arguments: Expected output: **Arguments:** """


    if arguments.startswith("\n    Arguments:"):
        arguments = "\n".join(map(lambda u: u[6:], arguments.strip().split("\n")[1:]))
        return "**Arguments:**\n\n%s\n\n" % arguments