// M18 T2 function to know the shortest path to any room
    function pathfinder(rmlist) {
        var nextlist = accumulate(function(a,b) {
            return append(a.getNeighbours(), b);
        }, [], rmlist);
        var prevlist = head(tail(this.shortestpath));
        var nextlist2 = accumulate(function(a,b) {
            if (is_empty_list(member(a, prevlist))) {
                return pair(a, remove(a, b));
            } else {
                return b;
            }
        }, [], nextlist);
        var protect = filter(function(x) {
            return is_instance_of(x, ProtectedRoom);
        }, nextlist2);
        if (is_empty_list(protect)) {
            this.shortestpath = pair(nextlist2, this.shortestpath);
            return pathfinder.call(this, nextlist2);
        } else {
            this.totravel = list(head(protect));
        }
    }

    // create a list for the actual path the player is going to take to get to protected room and stores it as this.totravel
    function createpath() {
        if (is_empty_list(this.shortestpath)) {

        } else {
            var next = head(this.shortestpath);
            var possible = (head(this.totravel)).getNeighbours();
            var move = accumulate(function(a,b) {
                if (is_empty_list(b)) {
                    if (is_empty_list(member(a, next))) {
                        return b;
                    } else {
                        return a;
                    }
                } else {
                    return b;
                }
            }, [], possible);
            this.totravel = pair(move, this.totravel);
            this.shortestpath = tail(this.shortestpath);
            return createpath.call(this);
        }
    }