implement storeService using 'with' function

Author: ivanhromovyi

src/main/kotlin/mate/academy/StoreService.kt

@@ -3,6 +3,10 @@ package mate.academy
 class StoreService {
     // Function to update the store's stock with `with`
     fun updateStoreStock(store: Store, extraShoes: Int, extraShirts: Int, extraJackets: Int) {
-        // TODO: implement
+        with(store) {
+            shoes += extraShoes
+            shirts += extraShirts
+            jackets += extraJackets
+        }
     }
 }