for (; i < length; i++) {
          char c = chars[i];
          if (isUpperCase(c)) {
            chars[i] = (char) (c ^ CASE_MASK);
          }
        }
        return String.valueOf(chars);
      }
    }
    return string;
  }

  /**
   * Returns a copy of the input character sequence in which all {@linkplain #isUpperCase(char)

        for (; i < length; i++) {
          char c = chars[i];
          if (isUpperCase(c)) {
            chars[i] = (char) (c ^ CASE_MASK);
          }
        }
        return String.valueOf(chars);
      }
    }
    return string;
  }

  /**
   * Returns a copy of the input character sequence in which all {@linkplain #isUpperCase(char)