public void delete(String input)
    {
        LinkedStack<String> addrStack = splitStr(input);
               
                ......
        }
                


private static LinkedStack<String> splitStr(String input)
    {
        LinkedStack<String> addrStack = new LinkedStack<String>();

        String[] s = input.split("\\.");
        for (int i = 0; i < s.length; i++)
        {
            if (i != s.length - 1)
            addrStack.push(s[i] + ".");
            else
                addrStack.push(s[i]);
        }

        return addrStack;
    }