added first draft at method to re-organize queue

AccessQueueService/Data/TakeANumberAccessQueueRepo.cs

@@ -104,5 +104,20 @@ namespace AccessQueueService.Data
             }
             return _accessTickets.Remove(userId);
         }
+
+        public void Optimize()
+        {
+            DeleteExpiredTickets();
+
+            var newQueue = new Dictionary<ulong, AccessTicket>();
+            var newQueueNumbers = new Dictionary<string, ulong>();
+            ulong newIndex = 0;
+            for (ulong i = _nowServing; i < _nextUnusedTicket; i++)
+            {
+                var user = _accessQueue[i];
+                newQueue[newIndex] = user;
+                newQueueNumbers[user.UserId] = newIndex;
+            }
+        }
     }
 }