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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 safe_unichr(codepoint):
 """ Safely return a Unicode string of length one, containing the Unicode character with given codepoint. :param int codepoint: the codepoint :rtype: string """

    if is_py2_narrow_build():
        return ("\\U%08x" % codepoint).decode("unicode-escape")
    elif PY2:
        return unichr(codepoint)
    return chr(codepoint)