public void addContact(String name, String phone) {
        Node<Contact> pos = lst;
        while(pos != null && name.equals(pos.getInfo().getName())){
            pos = pos.getNext();
        }
        if (pos != null){
            pos.getInfo().setPhone(phone);
        }else{
            pos = lst;
            Node<Contact> prev = null;
            while(pos != null && name.compareTo(pos.getInfo().getName())>0){
                prev = pos;
                pos = pos.getNext();
            }
            Contact c = new Contact(name, phone);
            if(prev != null){
                Node<Contact> tmp = new Node<Contact>(c, pos);
                prev.setNext(tmp);
            }else{
                Node<Contact> tmp = new Node<Contact>(c, lst);
                lst=tmp;
            }
            count++;
        }
        }