gistfile1.txt

public void stutter(ArrayList<String> list) {
    int l = list.size();
    // seed
    for (int i = 0; i < l; i++){
        list.add("");
    }
    // work backwards
    int f = list.size() - 1;
    for (int i = l - 1; i >= 0; i--){
        String temp = list.get(i);
        list.set(f, temp);
        list.set(f-1, temp);
        f = f - 2;
    }
    // f should be 0
    // i should be 0
    return;
}