[TASK] Content fixes

Assets/CollectableDuckManager.cs

@@ -37,6 +37,7 @@ public class CollectableDuckManager : MonoBehaviour
 
     private void Awake()
     {
+        CheckCollectableDuckIds();
         _collectedDucks.Clear();
         foreach (var duck in collectableDucks.Where(duck => PlayerPrefs.GetInt("duck." + duck.Id) > 0))
         {
@@ -44,6 +45,20 @@ public class CollectableDuckManager : MonoBehaviour
         }
     }
 
+    private void CheckCollectableDuckIds()
+    {
+        var duckIds = new HashSet<string>();
+        foreach (var duck in collectableDucks)
+        {
+            if (duckIds.Contains(duck.Id))
+            {
+                Debug.LogError("Duplicate duck ID: '" + duck.Id + "' for duck '" + duck.name + "'");
+            }
+
+            duckIds.Add(duck.Id);
+        }
+    }
+
     private void Update()
     {
         var ruler = new CheapRuler(map.CenterLatitudeLongitude.x, CheapRulerUnits.Meters);