public static List<String> rename(List<String> list) {
        List<String> renamed = new ArrayList<>();
        for(String str : list) {
            if (renamed.contains(str)) {
                int count = 1;
                if (renamed.contains(str + count)) {
                    renamed.add(str + (count + 1));
                } else {
                    renamed.add(str + count);
                }
            } else {
                renamed.add(str);
            }
        }
        return renamed;
    }