class Strings {

    public static String right(String string, int len) {
        if (string == null) {
            return EMPTY;
        }
        if (len < 0) {
            return EMPTY;
        }
        if (string.length() <= len) {
            return string;
        }
        return string.substring(string.length() - len);
    }

    protected  Strings();

}