@NlsSafe
    private static StringBuilder concatWithEx(StringBuilder builder, List<String> s, String glue, int N, String nthGlue) {
        int i = 1;
        for (Iterator<String> iterator = s.iterator(); iterator.hasNext(); i++) {
            String str = iterator.next();
            builder.append(str);
            if (iterator.hasNext()) {
                if (i % N == 0) {
                    builder.append(nthGlue);
                } else {
                    builder.append(glue);
                }
            }
        }
        return builder;
    }
@NlsSafe
    private static StringBuilder concatWithEx(StringBuilder builder, List<String> s, String glue, int N, String nthGlue)