public static List<Character> enigma(List<Character> kar1, int dv) {
    int n = kar1.size()/dv;
    if (n == 0)
        return kar1;
    List<List<Character>> daftar = new ArrayList<List<Character>>();
    for (int ii = dv-1; ii>=0; ii--) {
        List<Character> sub = new ArrayList<Character>();
        for (int kk = 0; kk < n; kk++) {
            sub.add(kar1.get(ii*n+kk));
        }
        daftar.add(enigma(sub,dv));
    }
    List<Character> kar2 = new ArrayList<Character>();
    Iterator <List<Character>> myIt = daftar.iterator();
    while (myIt.hasNext())
        kar2.addAll(myIt.next());
    System.out.println(kar2);
    return kar2;
}