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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 apply(self, folder):
 """Apply a patch from a git patch file. :param string folder: path of the folder where is the git repo cloned at. :raise: RuntimeError if the patch could not be applied. """

        logger.info("Apply Patch File %s", self.file_path)
        command = "git apply {}".format(self.file_path)
        return_code, stream_data = _run_command_inside_folder(command, folder)

        if return_code:
            msg = "Could not apply patch file at {}. Error: {}".format(self.file_path, stream_data)
            logger.error(msg)
            raise RuntimeError(msg)