code: def build_wheel(wheel_directory, config_settings, metadata_directory=None):
      
      prebuilt_whl = _find_already_built_wheel(metadata_directory)
      if prebuilt_whl:
          shutil.copy2(prebuilt_whl, wheel_directory)
          return os.path.basename(prebuilt_whl)
  
      return _build_backend().build_wheel(wheel_directory, config_settings,
                                          metadata_directory)
docs: Invoke the mandatory build_wheel hook.
  
      If a wheel was already built in the
      prepare_metadata_for_build_wheel fallback, this
      will copy it rather than rebuilding the wheel.