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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 get_default_filepath(cls):
 """Get the default filepath for the configuratin file."""

        if not cls.config_files:
            return None
        if not cls.config_searchpath:
            return None
        filename = cls.config_files[0]
        filepath = cls.config_searchpath[0]
        return os.path.join(filepath, filename)