def move_to_next(self):
        if self.curr.next == None:
            return
        else:
            self.curr.data = self.curr.next.data
            self.curr.next = self.curr.next.next
            self.curr.prev = self.curr.next.prev

    def move_to_prev(self):
        if self.curr == None:
            return
        else:
            self.curr.data = self.curr.prev.data
            self.curr.next = self.curr.prev.next
            self.curr.prev = self.curr.prev.prev

    def remove(self):
        if self.curr == None:
            return
        else:
            self.curr.data = self.curr.next.data
            self.curr.prev.next = self.curr.next
            self.curr.next.prev = self.curr.prev