class Strings {

    public static String leftTrim(String s) {
        if (s == null) return null;
        if (s.length() == 0) return EMPTY_STRING;
        int j = 0;
        for (int i = 0; i < s.length(); i++) {
            if (Character.isWhitespace(s.charAt(i)))
                j++;
            else
                break;
        }
        return s.substring(j);
    }

    private  Strings();

}