docs: def get_hash(input_string):
      """ Return the hash of the movie depending on the input string.
  
      If the input string looks like a symbolic link to a movie in a Kolekto
      tree, return its movies hash, else, return the input directly in lowercase.
      """
  
      # Check if the input looks like a link to a movie:
      if os.path.islink(input_string):
          directory, movie_hash = os.path.split(os.readlink(input_string))
          input_string = movie_hash
  
      return input_string.lower()