code: def make_filename(string: str) -> str:
      return no_fn_re.sub("", string) or "sphinx"
  
imports: from __future__ import annotations
  import contextlib
  import filecmp
  import os
  import re
  import shutil
  import sys
  import unicodedata
  from io import StringIO
  from os import path
  from typing import TYPE_CHECKING, Any
  from sphinx.deprecation import _deprecation_warning
label_desc: Use image node_id 9 for calling a global function with example usage: make_filename(string) and returns: unknown