public static boolean isFullwidthCharacter(int codePoint) {
    if (!Character.isValidCodePoint(codePoint)) {
      return false;
    }
    Character.UnicodeBlock block = Character.UnicodeBlock.of(codePoint);
    if (block == null) {
      return false;
    }
    return FULLWIDTH_BLOCKS.contains(block);
  }
public static boolean isFullwidthCharacter(int codePoint)