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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 quote_identifier(self, string):
 """ Quotes a string so that it can be safely used as a table or column name, even if it is a reserved word of the platform. This also detects identifier chains separated by dot and quotes them independently. :param string: The identifier name to be quoted. :type string: str :return: The quoted identifier string. :rtype: str """

        if "." in string:
            parts = list(map(self.quote_single_identifier, string.split(".")))

            return ".".join(parts)

        return self.quote_single_identifier(string)