code: def img_string_normalize(im):
      return img_to_string(string_to_img(im))
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image, ImageMorph, _imagingmorph
  from .helper import assert_image_equal_tofile, hopper
label_desc: Use image node_id 3 for calling a global function with example usage: img_string_normalize(im) and returns: img_to_string