for (int i = 0; i < sz; i++) {
            if (isAsciiPrintable(cs.charAt(i)) == false) {
                return false;
            }
        }
        return true;
    }

    private static boolean isAsciiPrintable(final char ch) {
        return ch >= 32 && ch < 127;
    }

    public static String newStringUnsafe(final char[] chars) {
        if (chars == null) {
            return null;