def METHOD_NAME(fuzz_target_path, extension_or_suffix):
  """Get supporting file for a fuzz target with the provided extension."""
  base_fuzz_target_path = fuzz_target_path
  # Strip any known extensions.
  for ext in ALLOWED_FUZZ_TARGET_EXTENSIONS:
    if not ext:
      continue
    if base_fuzz_target_path.endswith(ext):
      base_fuzz_target_path = base_fuzz_target_path[:-len(ext)]
      break
  return base_fuzz_target_path + extension_or_suffix