deleted empty lines

src/main/java/spring/boot/bookstore/controller/CategoryController.java

@@ -31,7 +31,6 @@
 @RestController
 @RequestMapping(value = "/categories")
 public class CategoryController {
-
     private static final Logger logger = LogManager.getLogger(BookController.class);
     private final CategoryService categoryService;
     private final BookService bookService;

src/main/java/spring/boot/bookstore/model/CartItem.java

@@ -26,18 +26,14 @@ public class CartItem {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
-
     @ManyToOne
     @JoinColumn(name = "shopping_carts_id", nullable = false)
     private ShoppingCart shoppingCart;
-
     @OneToOne
     @JoinColumn(name = "books_id", nullable = false)
     private Book book;
-
     @Column(name = "quantity", nullable = false)
     private int quantity;
-
     @Column(name = "is_deleted", nullable = false)
     private boolean isDeleted = false;
 }

src/main/java/spring/boot/bookstore/model/ShoppingCart.java

@@ -33,7 +33,6 @@ public class ShoppingCart {
     @OneToOne
     @JoinColumn(name = "user_id", nullable = false)
     private User user;
-
     @ManyToMany
     @JoinTable(name = "shopping_cart_items",
             joinColumns = @JoinColumn(name = "shopping_cart_id"),

src/main/java/spring/boot/bookstore/repository/CategoryRepository.java

@@ -6,6 +6,5 @@
 
 @Repository
 public interface CategoryRepository extends JpaRepository<Category, Long> {
-
 }