docs: def string_width(word: str) -> int:
      """
      :param word:
      :return: Widths of word
  
      Usage:
  
          >>> string_width('abc')
          3
          >>> string_width('Ａbしー')
          7
          >>> string_width('')
          0
      """
      return sum(map(lambda x: 2 if east_asian_width(x) in 'FWA' else 1, word))