code: def line_starts_subpgm(line: str) -> Tuple[bool, Optional[str]]:
      
  
      match = RE_SUB_START.match(line)
      if match != None:
          f_name = match.group(1)
          return (True, f_name)
  
      match = RE_FN_START.match(line)
      if match != None:
          f_name = match.group(1)
          return (True, f_name)
  
      return (False, None)
docs: Indicates whether a line in the program is the first line of a subprogram
      definition.
  
      Args:
          line
      Returns:
         (True, f_name) if line begins a definition for subprogram f_name;
         (False, None) if line does not begin a subprogram definition.