private String cleanString(String in) {
        char[] c = in.toCharArray();

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < c.length && i < 20; i++) {
            if (Character.isLetterOrDigit(c[i]) || c[i] == '-') {
                sb.append(c[i]);
            }
        }
        return sb.toString();
    }