public bool UnmarkToDo([FromBody] ChangeToDoState s)
        {
            bool isMarked = _manager.UnmarkToDo(s.id);

            return(isMarked);
        }
        public bool MarkToDo([FromBody] ChangeToDoState m)
        {
            bool isMarked = _manager.MarkToDo(m.id);

            return(isMarked);
        }