code: def normalize_cjk_fullwidth_ascii(seq: str) -> str:
      
  
      def convert(char: str) -> str:
          code_point = ord(char)
          if not 0xFF01 <= code_point <= 0xFF5E:
              return char
          return chr(code_point - 0xFEE0)
  
      return ''.join(map(convert, seq))
docs: Conver fullwith ASCII to halfwidth ASCII.
      See https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms