code: def extract_configs(self):
          
  
          nvram_file = os.path.join(self.working_dir, "nvram_{:05d}".format(self.application_id))
          if not os.path.exists(nvram_file):
              return None, None
          try:
              with open(nvram_file, "rb") as file:
                  nvram_content = file.read()
          except OSError as e:
              log.warning("Cannot read nvram file {}: {}".format(nvram_file, e))
              return None, None
  
          try:
              startup_config_content, private_config_content = nvram_export(nvram_content)
          except ValueError as e:
              log.warning("Could not export configs from nvram file {}: {}".format(nvram_file, e))
              return None, None
  
          return startup_config_content, private_config_content
docs: Gets the contents of the config files
          startup-config and private-config from NVRAM.
  
          :returns: tuple (startup-config, private-config)