day 21b incomplete

tried doing it, very close, I believe I have missed a very simple step or some edge case is not being run.

Value is currently way below what is expected So I either think one of the data structures is behaving badly, or I have missed a key point

shared/LinkedListGameBoard.go

@@ -14,3 +14,42 @@ type Player struct {
 	Score     int
 	Position  *GamePosition
 }
+
+type Universe struct {
+	Players map[int]*Player
+}
+
+type QueueItem struct {
+	Universe *Universe
+	Next     *QueueItem
+}
+
+type UniverseQueue struct {
+	Head *QueueItem
+	Tail *QueueItem
+}
+
+func (q *UniverseQueue) Pop() (universe *Universe) {
+	universe = nil
+	if q.Head != nil {
+		universe = q.Head.Universe
+		q.Head = q.Head.Next
+		if q.Head == nil {
+			q.Tail = nil
+		}
+	}
+	return
+}
+
+func (q *UniverseQueue) Add(universe *Universe) {
+	newUniverse := new(QueueItem)
+	newUniverse.Universe = universe
+
+	if q.Tail != nil {
+		q.Tail.Next = newUniverse
+	} else {
+		q.Head = newUniverse
+	}
+
+	q.Tail = newUniverse
+}

shared/Queue.go

@@ -0,0 +1,29 @@
+package shared
+
+type Queue struct {
+	Head *Node
+	Tail *Node
+}
+
+func (q *Queue) Pop() (node *Node) {
+	node = nil
+	if q.Head != nil {
+		node = q.Head
+		q.Head = q.Head.Next
+		if q.Head == nil {
+			q.Tail = nil
+		}
+	}
+	return
+}
+
+func (q *Queue) Add(node *Node) {
+
+	if q.Tail != nil {
+		q.Tail.Next = node
+	} else {
+		q.Head = node
+	}
+
+	q.Tail = node
+}