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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 _find_files(self):
 """Find files recursively in the root path using provided extensions. :return: list of absolute file paths """

        files = []
        for ext in self.extensions:
            ext_files = util.find_files(self.root, "*" + ext)
            log.debug("found {} '*{}' files in '{}'".format(
                len(ext_files), ext, self.root)
            )
            files.extend(ext_files)
        return files