diff --git a/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/MassiveGenericObjects.cs b/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/MassiveGenericObjects.cs
index f2ab9f9..d58ec9d 100644
--- a/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/MassiveGenericObjects.cs
+++ b/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/MassiveGenericObjects.cs
@@ -63,15 +63,10 @@ internal class MassiveGenericObjects<T> : ICollectionGenericObjects<T>
 
     public int Insert(T obj, IEqualityComparer<T?>? comparer = null)
     {
-        if (comparer != null)
+        int index = Array.IndexOf(_collection, null);
+        if (_collection.Contains(obj, comparer))
         {
-            for (int i = 0; i < Count; i++)
-            {
-                if (comparer.Equals(_collection[i], obj))
-                {
-                    throw new CollectionInsertException(obj);
-                }
-            }
+            throw new CollectionInsertException(obj);
         }
         for (int i = 0; i < Count; i++)
         {
@@ -84,53 +79,45 @@ internal class MassiveGenericObjects<T> : ICollectionGenericObjects<T>
         throw new CollectionOverflowException(Count);
     }
 
-        public int Insert(T obj, int position, IEqualityComparer<T?>? comparer = null)
+    public int Insert(T obj, int position, IEqualityComparer<T?>? comparer = null)
     {
-        if (position < 0 || position >= Count)
+        if (_collection.Contains(obj, comparer))
         {
+            throw new CollectionInsertException(obj);
+        }
+        if (position >= Count || position < 0)
             throw new PositionOutOfCollectionException(position);
-        }
 
-        if (comparer != null)
-        {
-            for (int i = 0; i < Count; i++)
-            {
-                if (comparer.Equals(_collection[i], obj))
-                {
-                    throw new CollectionInsertException(obj);
-                }
-            }
-        }
-
-        if (position >= _collection.Length || position < 0) throw new PositionOutOfCollectionException(position);
         if (_collection[position] == null)
         {
             _collection[position] = obj;
             return position;
         }
-        int index = position + 1;
-        while (index < _collection.Length)
+
+        int temp = position + 1;
+        while (temp < Count)
         {
-            if (_collection[index] == null)
+            if (_collection[temp] == null)
             {
-                _collection[index] = obj;
-                return index;
+                _collection[temp] = obj;
+                return temp;
             }
-            ++index;
+            temp++;
         }
-        index = position - 1;
-        while (index >= 0)
+
+        temp = position - 1;
+        while (temp > 0)
         {
-            if (_collection[index] == null)
+            if (_collection[temp] == null)
             {
-                _collection[index] = obj;
-                return index;
+                _collection[temp] = obj;
+                return temp;
             }
-            --index;
+            temp--;
         }
+
         throw new CollectionOverflowException(Count);
     }
-
     public T? Remove(int position)
     {
         if (position < 0 || position >= Count) throw new PositionOutOfCollectionException(position);
@@ -150,10 +137,11 @@ internal class MassiveGenericObjects<T> : ICollectionGenericObjects<T>
 
     public void CollectionSort(IComparer<T?> comparer)
     {
-        List<T?> value = new List<T?>(_collection);
-        value.Sort(comparer);
-        value.CopyTo(_collection, 0);
+        if (_collection?.Length > 0)
+        {
+            Array.Sort(_collection, comparer);
+            Array.Reverse(_collection);
+        }
     }
-
-
 }
+
diff --git a/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/StorageCollection.cs b/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/StorageCollection.cs
index cc1a24b..5fbb369 100644
--- a/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/StorageCollection.cs
+++ b/TrolleybusProject/TrolleybusProject/CollectionGenericObjects/StorageCollection.cs
@@ -211,8 +211,7 @@ public class StorageCollection<T>
     /// </summary>
     /// <param name="collectionType"></param>
     /// <returns></returns>
-    private static ICollectionGenericObjects<T>?
-        CreateCollection(CollectionType collectionType)
+    private static ICollectionGenericObjects<T>?CreateCollection(CollectionType collectionType)
     {
         return collectionType switch
         {
diff --git a/TrolleybusProject/TrolleybusProject/Drawnings/DrawningBusCompareByColor.cs b/TrolleybusProject/TrolleybusProject/Drawnings/DrawningBusCompareByColor.cs
index 81716a7..287782e 100644
--- a/TrolleybusProject/TrolleybusProject/Drawnings/DrawningBusCompareByColor.cs
+++ b/TrolleybusProject/TrolleybusProject/Drawnings/DrawningBusCompareByColor.cs
@@ -10,14 +10,18 @@ public class DrawningBusCompareByColor: IComparer<DrawningBus?>
 {
     public int Compare(DrawningBus? x, DrawningBus? y)
     {
-        if (x == null || x.EntityBus == null)
+        if (x == null && y == null)
         {
-            return 1;
+            return 0;
+        }
+        if (x == null || x.EntityBus== null)
+        {
+            return -1;
         }
 
         if (y == null || y.EntityBus == null)
         {
-            return -1;
+            return 1;
         }
         var bodycolorCompare = x.EntityBus.BodyColor.Name.CompareTo(y.EntityBus.BodyColor.Name);
         if (bodycolorCompare != 0)