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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_deprecated(deprecated):
 """ Makes the deprecated description pretty and returns a formatted string if `deprecated` is not an empty string. Otherwise, returns None. Expected input: Expected output: **Deprecated:** """


    if deprecated != "":
        deprecated = "\n".join(map(lambda n: n[4:], deprecated.split("\n")))
        return "**Deprecated:**\n%s\n" % deprecated