code: def aux_listing(aux_root):
      
  
      listing = []
  
      for root, _, fnames in os.walk(aux_root):
          count = len(aux_root.split(os.sep))
          prefix = root.split(os.sep)[count:]
  
          for fname in fnames:
              listing.append(os.sep.join(prefix + [fname]))
  
      return listing
docs: Listing