fix: Update instead of re-fill

CarManagerV2/Car.cs

@@ -54,7 +54,12 @@ namespace CarManagerV2
 
         public bool IsChanged(Car other)
         {
-            return make != other.make || model != other.model || year != other.year || color != other.color || mileage != other.mileage || price != other.price;
+            return make != other.make || model != other.model || year != other.year || color != other.color || mileage != other.mileage || price != other.price || other.color != color;
+        }
+
+        public Car Clone()
+        {
+            return new Car(id, make, model, year, color, mileage, price);
         }
     }
 }