/**
   * Returns a copy of the input string in which all {@linkplain #isUpperCase(char) uppercase ASCII
   * characters} have been converted to lowercase. All other characters are copied without
   * modification.
   */
  public static String toLowerCase(String string) {
    int length = string.length();
    for (int i = 0; i < length; i++) {
      if (isUpperCase(string.charAt(i))) {
        char[] chars = string.toCharArray();

  /**
   * Returns a copy of the input string in which all {@linkplain #isUpperCase(char) uppercase ASCII
   * characters} have been converted to lowercase. All other characters are copied without
   * modification.
   */
  public static String toLowerCase(String string) {
    int length = string.length();
    for (int i = 0; i < length; i++) {
      if (isUpperCase(string.charAt(i))) {
        char[] chars = string.toCharArray();

        if (isEmpty(name)) {
            return name;
        }
        final char[] chars = name.toCharArray();
        if (chars.length >= 2 && Character.isUpperCase(chars[0]) && Character.isUpperCase(chars[1])) {
            return name;
        }
        chars[0] = Character.toLowerCase(chars[0]);
        return new String(chars);
    }

    /**

        if (Ascii.isLowerCase(c)) {
          return true;
        }
      }
      return false;
    }

    private boolean hasUpperCase() {
      for (char c : chars) {
        if (Ascii.isUpperCase(c)) {
          return true;
        }
      }
      return false;
    }

    Alphabet upperCase() {
      if (!hasLowerCase()) {
        return this;
      }

     */
    protected boolean containsUppercase(final String password) {
        for (int i = 0; i < password.length(); i++) {
            if (Character.isUpperCase(password.charAt(i))) {
                return true;
            }
        }
        return false;
    }

    /**
     * Checks if the password contains at least one lowercase letter.
     *