diff --git a/clean-architecture/pom.xml b/clean-architecture/pom.xml
index e47a9df79..8222c6d9d 100644
--- a/clean-architecture/pom.xml
+++ b/clean-architecture/pom.xml
@@ -39,6 +39,14 @@
             <artifactId>junit-jupiter-engine</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+        </dependency>
     </dependencies>
     <build>
         <plugins>
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/App.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/App.java
index 214388c33..ef6785391 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/App.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/App.java
@@ -3,16 +3,13 @@ package com.iluwatar.cleanarchitecture;
 import lombok.extern.slf4j.Slf4j;
 
 /**
- * Clean Architecture ensures separation of concerns by organizing code,
- * into layers and making it scalable and maintainable.
+ * Clean Architecture ensures separation of concerns by organizing code, into layers and making it
+ * scalable and maintainable.
  *
- * <p>In the example there are  Entities (Core Models) – Product, Cart,
- * Order handle business logic.
- * Use Cases (Application Logic) – ShoppingCartService manages
- * operations like adding items and checkout.
- * Interfaces & Adapters – Repositories (CartRepository, OrderRepository)
- * abstract data handling,
- * while controllers (CartController, OrderController) manage interactions.
+ * <p>In the example there are Entities (Core Models) – Product, Cart, Order handle business logic.
+ * Use Cases (Application Logic) – ShoppingCartService manages operations like adding items and
+ * checkout. Interfaces & Adapters – Repositories (CartRepository, OrderRepository) abstract data
+ * handling, while controllers (CartController, OrderController) manage interactions.
  */
 @Slf4j
 public final class App {
@@ -31,10 +28,8 @@ public final class App {
     CartRepository cartRepository = new InMemoryCartRepository();
     OrderRepository orderRepository = new InMemoryOrderRepository();
 
-    ShoppingCartService
-        shoppingCartUseCase =
-        new ShoppingCartService(
-            productRepository, cartRepository, orderRepository);
+    ShoppingCartService shoppingCartUseCase =
+        new ShoppingCartService(productRepository, cartRepository, orderRepository);
 
     CartController cartController = new CartController(shoppingCartUseCase);
     OrderController orderController = new OrderController(shoppingCartUseCase);
@@ -46,7 +41,7 @@ public final class App {
     Order order = orderController.checkout(userId);
     LOGGER.info("Total: ${}" + cartController.calculateTotal(userId));
 
-    LOGGER.info("Order placed! Order ID: {}, Total: ${}",
-        order.getOrderId(), order.getTotalPrice());
+    LOGGER.info(
+        "Order placed! Order ID: {}, Total: ${}", order.getOrderId(), order.getTotalPrice());
   }
 }
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Cart.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Cart.java
index d31fc00b8..045ca8d22 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Cart.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Cart.java
@@ -29,20 +29,17 @@ package com.iluwatar.cleanarchitecture;
 import lombok.Getter;
 
 /**
- * Represents a shopping cart containing a product and its quantity.
- * This class calculates the total price of the product based on its price and quantity.
+ * Represents a shopping cart containing a product and its quantity. This class calculates the total
+ * price of the product based on its price and quantity.
  */
 @Getter
 public class Cart {
-  /**
-   * The product in the cart.
-   * It holds the product details such as name, price, and description.
-   */
+  /** The product in the cart. It holds the product details such as name, price, and description. */
   private final Product product;
 
   /**
-   * The quantity of the product in the cart.
-   * It represents how many units of the product are added to the cart.
+   * The quantity of the product in the cart. It represents how many units of the product are added
+   * to the cart.
    */
   private final int quantity;
 
@@ -58,13 +55,12 @@ public class Cart {
   }
 
   /**
-   * Calculates the total price of the products in the cart.
-   * The total price is the product's price multiplied by the quantity.
+   * Calculates the total price of the products in the cart. The total price is the product's price
+   * multiplied by the quantity.
    *
    * @return the total price of the products in the cart.
    */
   public double getTotalPrice() {
     return product.getPrice() * quantity;
   }
-
 }
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartController.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartController.java
index a586ea10c..9cfaa118e 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartController.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartController.java
@@ -30,12 +30,11 @@ package com.iluwatar.cleanarchitecture;
 /**
  * Controller class for handling shopping cart operations.
  *
- * <p>This class provides methods to add, remove, and calculate the
- * total price of items in a user's shopping cart.</p>
+ * <p>This class provides methods to add, remove, and calculate the total price of items in a user's
+ * shopping cart.
  */
 public class CartController {
 
-
   /** Service layer responsible for cart operations. */
   private final ShoppingCartService shoppingCartUseCase;
 
@@ -55,8 +54,7 @@ public class CartController {
    * @param productId The ID of the product to be added.
    * @param quantity The quantity of the product.
    */
-  public void addItemToCart(
-      final String userId, final String productId, final int quantity) {
+  public void addItemToCart(final String userId, final String productId, final int quantity) {
     shoppingCartUseCase.addItemToCart(userId, productId, quantity);
   }
 
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartRepository.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartRepository.java
index 9e3c7dfe9..146350076 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartRepository.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/CartRepository.java
@@ -28,9 +28,7 @@ package com.iluwatar.cleanarchitecture;
 
 import java.util.List;
 
-/**
- * CartRepository.
- */
+/** CartRepository. */
 public interface CartRepository {
   /**
    * Adds an item to the user's cart.
@@ -40,6 +38,7 @@ public interface CartRepository {
    * @param quantity The quantity of the product.
    */
   void addItemToCart(String userId, Product product, int quantity);
+
   /**
    * Removes an item from the user's cart.
    *
@@ -47,6 +46,7 @@ public interface CartRepository {
    * @param productId The ID of the product to be removed.
    */
   void removeItemFromCart(String userId, String productId);
+
   /**
    * Retrieves the list of items in the user's cart.
    *
@@ -54,6 +54,7 @@ public interface CartRepository {
    * @return A list of items in the cart.
    */
   List<Cart> getItemsInCart(String userId);
+
   /**
    * Calculates the total price of the items in the user's cart.
    *
@@ -61,6 +62,7 @@ public interface CartRepository {
    * @return The total price of all items in the cart.
    */
   double calculateTotal(String userId);
+
   /**
    * Clears all items from the user's cart.
    *
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryCartRepository.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryCartRepository.java
index b107a4285..afdc866d7 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryCartRepository.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryCartRepository.java
@@ -34,25 +34,21 @@ import java.util.Map;
 /**
  * Implementation of {@link CartRepository} that stores cart items in memory.
  *
- * <p>This class maintains a map of user carts where each user has a
- * list of cart items.</p>
+ * <p>This class maintains a map of user carts where each user has a list of cart items.
  */
 public class InMemoryCartRepository implements CartRepository {
-  /**
-   * A map storing user carts with their respective cart items.
-   */
+  /** A map storing user carts with their respective cart items. */
   private final Map<String, List<Cart>> userCarts = new HashMap<>();
 
   /**
    * Adds an item to the user's cart.
    *
-   * @param userId  The ID of the user.
+   * @param userId The ID of the user.
    * @param product The product to be added.
    * @param quantity The quantity of the product.
    */
   @Override
-  public void addItemToCart(
-      final String userId, final Product product, final int quantity) {
+  public void addItemToCart(final String userId, final Product product, final int quantity) {
     List<Cart> cart = userCarts.getOrDefault(userId, new ArrayList<>());
     cart.add(new Cart(product, quantity));
     userCarts.put(userId, cart);
@@ -91,8 +87,7 @@ public class InMemoryCartRepository implements CartRepository {
    */
   @Override
   public double calculateTotal(final String userId) {
-    return userCarts.getOrDefault(userId, new ArrayList<>())
-        .stream()
+    return userCarts.getOrDefault(userId, new ArrayList<>()).stream()
         .mapToDouble(Cart::getTotalPrice)
         .sum();
   }
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryOrderRepository.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryOrderRepository.java
index 2dab179a7..cce7a3818 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryOrderRepository.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryOrderRepository.java
@@ -32,8 +32,8 @@ import java.util.List;
 /**
  * An in-memory implementation of the {@link OrderRepository}.
  *
- * <p>This class stores orders in a list, allowing orders to be saved
- * but not persisted beyond the application's runtime.</p>
+ * <p>This class stores orders in a list, allowing orders to be saved but not persisted beyond the
+ * application's runtime.
  */
 public class InMemoryOrderRepository implements OrderRepository {
   /** A list to store orders in memory. */
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryProductRepository.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryProductRepository.java
index e7e0c8882..af052ef14 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryProductRepository.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/InMemoryProductRepository.java
@@ -32,32 +32,28 @@ import java.util.Map;
 /**
  * In-memory implementation of the {@link ProductRepository} interface.
  *
- * <p>This repository stores products in memory
- * allowing retrieval by product ID.</p>
+ * <p>This repository stores products in memory allowing retrieval by product ID.
  */
 public class InMemoryProductRepository implements ProductRepository {
-  /**
-   * A map to store products by their unique product ID.
-   */
+  /** A map to store products by their unique product ID. */
   private final Map<String, Product> products = new HashMap<>();
+
   /**
    * The price of the Laptop in USD.
-   * <p>Used in the in-memory product repository
-   * to define the cost of a Laptop.</p>
+   *
+   * <p>Used in the in-memory product repository to define the cost of a Laptop.
    */
   private static final double LAPTOP_PRICE = 1000.0;
 
   /**
    * The price of the Smartphone in USD.
-   * <p>Used in the in-memory product repository
-   * to define the cost of a Smartphone.</p>
+   *
+   * <p>Used in the in-memory product repository to define the cost of a Smartphone.
    */
   private static final double SMARTPHONE_PRICE = 500.0;
 
-
   /**
-   * Constructs an {@code InMemoryProductRepository} and
-   * initializes it with some example products.
+   * Constructs an {@code InMemoryProductRepository} and initializes it with some example products.
    */
   public InMemoryProductRepository() {
     products.put("1", new Product("1", "Laptop", LAPTOP_PRICE));
@@ -68,8 +64,7 @@ public class InMemoryProductRepository implements ProductRepository {
    * Retrieves a product by its unique ID.
    *
    * @param productId The ID of the product to retrieve.
-   * @return The {@link Product} corresponding to the given ID
-   *         {@code null} if not found.
+   * @return The {@link Product} corresponding to the given ID {@code null} if not found.
    */
   @Override
   public Product getProductById(final String productId) {
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Order.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Order.java
index 673d2108b..63505dcf0 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Order.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Order.java
@@ -30,33 +30,27 @@ import java.util.List;
 import lombok.Getter;
 
 /**
- * Represents an order placed by a user containing
- * the ordered items and total price.
+ * Represents an order placed by a user containing the ordered items and total price.
  *
- * <p>An order includes a unique order ID, a list of cart items
- * and the total price of the order.</p>
+ * <p>An order includes a unique order ID, a list of cart items and the total price of the order.
  */
 @Getter
 public class Order {
-  /**
-   * The unique identifier for this order.
-   */
+  /** The unique identifier for this order. */
   private final String orderId;
-  /**
-   * The list of items included in this order.
-   */
+
+  /** The list of items included in this order. */
   private final List<Cart> items;
-  /**
-   * The list of items included in this order.
-   */
+
+  /** The list of items included in this order. */
   private final double totalPrice;
 
   /**
-   * Constructs an {@code Order} with the given order ID and list of cart items.
-   * The total price is based on the individual item prices in the cart.
+   * Constructs an {@code Order} with the given order ID and list of cart items. The total price is
+   * based on the individual item prices in the cart.
    *
    * @param id The unique identifier for the order.
-   * @param item   The list of cart items included in the order.
+   * @param item The list of cart items included in the order.
    */
   public Order(final String id, final List<Cart> item) {
     this.orderId = id;
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderController.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderController.java
index f7c8e966b..36844288d 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderController.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderController.java
@@ -29,16 +29,12 @@ package com.iluwatar.cleanarchitecture;
 /**
  * Controller for handling order-related operations.
  *
- * <p>This class provides an endpoint for users to checkout their cart
- * and place an order.</p>
+ * <p>This class provides an endpoint for users to checkout their cart and place an order.
  */
 public class OrderController {
-  /**
-   * Service for managing shopping cart operations.
-   */
+  /** Service for managing shopping cart operations. */
   private final ShoppingCartService shoppingCartUseCase;
 
-
   /**
    * Constructs an {@code OrderController} with the given shopping cart service.
    *
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderRepository.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderRepository.java
index f722a6b43..f29b90759 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderRepository.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/OrderRepository.java
@@ -29,7 +29,7 @@ package com.iluwatar.cleanarchitecture;
 /**
  * Repository interface for managing order persistence.
  *
- * <p>This interface defines the contract for storing orders in the system.</p>
+ * <p>This interface defines the contract for storing orders in the system.
  */
 public interface OrderRepository {
   /**
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Product.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Product.java
index b64093418..dd7050ea9 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Product.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/Product.java
@@ -28,9 +28,7 @@ package com.iluwatar.cleanarchitecture;
 
 import lombok.Getter;
 
-/**
- * Represents a product in the system.
- */
+/** Represents a product in the system. */
 @Getter
 public class Product {
   /** The unique identifier for the product. */
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ProductRepository.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ProductRepository.java
index 1dde70005..6b9324fd5 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ProductRepository.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ProductRepository.java
@@ -26,9 +26,7 @@
  */
 package com.iluwatar.cleanarchitecture;
 
-/**
- * Repository interface for handling product-related operations.
- */
+/** Repository interface for handling product-related operations. */
 public interface ProductRepository {
   /**
    * Retrieves a product by its unique identifier.
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ShoppingCartService.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ShoppingCartService.java
index 9f6225a81..960b1a18b 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ShoppingCartService.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/ShoppingCartService.java
@@ -31,18 +31,19 @@ import java.util.List;
 /**
  * Service class for managing shopping cart operations.
  *
- * <p>This class provides functionalities to add and remove items from the cart,
- * calculate the total price, and handle checkout operations.</p>
+ * <p>This class provides functionalities to add and remove items from the cart, calculate the total
+ * price, and handle checkout operations.
  */
 public class ShoppingCartService {
   /** Repository for managing product data. */
   private final ProductRepository productRepository;
+
   /** Repository for managing cart data. */
   private final CartRepository cartRepository;
+
   /** Repository for managing order data. */
   private final OrderRepository orderRepository;
 
-
   /**
    * Constructs a ShoppingCartService with the required repositories.
    *
@@ -50,9 +51,10 @@ public class ShoppingCartService {
    * @param repository The repository to manage cart operations.
    * @param ordRepository The repository to handle order persistence.
    */
-  public ShoppingCartService(final ProductRepository pdtRepository,
-                                 final CartRepository repository,
-                                 final OrderRepository ordRepository) {
+  public ShoppingCartService(
+      final ProductRepository pdtRepository,
+      final CartRepository repository,
+      final OrderRepository ordRepository) {
     this.productRepository = pdtRepository;
     this.cartRepository = repository;
     this.orderRepository = ordRepository;
@@ -65,13 +67,13 @@ public class ShoppingCartService {
    * @param productId The ID of the product to be added.
    * @param quantity The quantity of the product.
    */
-  public void addItemToCart(
-      final String userId, final String productId, final int quantity) {
+  public void addItemToCart(final String userId, final String productId, final int quantity) {
     Product product = productRepository.getProductById(productId);
     if (product != null) {
       cartRepository.addItemToCart(userId, product, quantity);
     }
   }
+
   /**
    * Removes an item from the user's shopping cart.
    *
@@ -95,8 +97,8 @@ public class ShoppingCartService {
   /**
    * Checks out the user's cart and creates an order.
    *
-   * <p>This method retrieves the cart items, generates an order ID,
-   * creates a new order, saves it, and clears the cart.</p>
+   * <p>This method retrieves the cart items, generates an order ID, creates a new order, saves it,
+   * and clears the cart.
    *
    * @param userId The ID of the user.
    * @return The created order containing purchased items.
diff --git a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/package-info.java b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/package-info.java
index 59bf905a4..027c4b2dc 100644
--- a/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/package-info.java
+++ b/clean-architecture/src/main/java/com/iluwatar/cleanarchitecture/package-info.java
@@ -1,10 +1,7 @@
 /**
- * Provides classes and interfaces for the clean architecture
- * pattern implementation.
+ * Provides classes and interfaces for the clean architecture pattern implementation.
  *
- * <p>This package includes classes for managing products, carts,
- * orders, repositories,
- * and services for a shopping cart system, following the
- * clean architecture principles.</p>
+ * <p>This package includes classes for managing products, carts, orders, repositories, and services
+ * for a shopping cart system, following the clean architecture principles.
  */
 package com.iluwatar.cleanarchitecture;
diff --git a/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/AppTest.java b/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/AppTest.java
index d78baf351..e5904f3d0 100644
--- a/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/AppTest.java
+++ b/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/AppTest.java
@@ -1,20 +1,19 @@
 package com.iluwatar.cleanarchitecture;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.*;
 
+import org.junit.jupiter.api.Test;
+
 class AppTest {
   /**
    * Issue: Add at least one assertion to this test case.
    *
-   * Solution: Inserted assertion to check whether the execution of the main method in {@link App}
-   * throws an exception.
+   * <p>Solution: Inserted assertion to check whether the execution of the main method in {@link
+   * App} throws an exception.
    */
-
   @Test
   void shouldExecuteApplicationWithoutException() {
 
-    assertDoesNotThrow(() -> App.main(new String[]{}));
+    assertDoesNotThrow(() -> App.main(new String[] {}));
   }
-}
\ No newline at end of file
+}
diff --git a/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/CartControllerTest.java b/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/CartControllerTest.java
index ec1d1bb29..17af44171 100644
--- a/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/CartControllerTest.java
+++ b/clean-architecture/src/test/java/com/iluwatar/cleanarchitecture/CartControllerTest.java
@@ -1,9 +1,9 @@
 package com.iluwatar.cleanarchitecture;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 
 public class CartControllerTest {
 
@@ -15,7 +15,8 @@ public class CartControllerTest {
     ProductRepository productRepository = new InMemoryProductRepository();
     CartRepository cartRepository = new InMemoryCartRepository();
     OrderRepository orderRepository = new InMemoryOrderRepository();
-    shoppingCartUseCase = new ShoppingCartService(productRepository, cartRepository, orderRepository);
+    shoppingCartUseCase =
+        new ShoppingCartService(productRepository, cartRepository, orderRepository);
     cartController = new CartController(shoppingCartUseCase);
   }
 
@@ -38,4 +39,4 @@ public class CartControllerTest {
 
     assertEquals(1000.0, cartController.calculateTotal("user123"));
   }
-}
\ No newline at end of file
+}