code: def split_string(joined, split_char="_"):
      """Split joined string and substitute back the null characters with an
      underscore if necessary.
  
      Inverse function of `join_strings(strings)`.
  
      Args:
          joined: str, the joined representation of the substrings.
          split_char: str, the character to split by.
  
      Returns:
          A tuple of strings with the splitting character (underscore) removed.
  
      Examples:
      ```python
          >>> split_string('asd__\x00xcv\x00\x00')
          ('asd', '', '_xcv__')
      ```
      """
      strings = joined.split(split_char)
      strings_copy = []
      for s in strings:
          strings_copy.append(s.replace("\0", split_char))
      return tuple(strings_copy)
  
imports: import queue
  from functools import wraps
label_desc: Use image node_id 3 for calling a global function with example usage: split_string(joined, split_char) and returns: tuple