Method MoveRight

src/UTF8StringSlice.hpp:134–141

  }

  void MoveRight() {
    if (utf8Length > 0) {
      const size_t charLen = UTF8Util::NextCharLength(str);
      str += charLen;
      utf8Length--;
      byteLength -= charLen;
    }
  }

  void MoveLeft() {
    if (utf8Length > 0) {