Clean up unused imports and comments

Author: codesungrape

src/main/java/com/codesungrape/hmcts/BookAPI/service/BookService.java

@@ -6,9 +6,6 @@
 import lombok.RequiredArgsConstructor;
 
 import com.codesungrape.hmcts.BookAPI.entity.Book;
-import java.util.List;
-import java.util.Optional;
-import java.util.UUID;
 
 /**
  * Service layer responsible for all business logic related to the Book resource.
@@ -22,7 +19,7 @@ public class BookService {
 
     // 1. CREATE Operation (POST /books)
     public Book createBook(BookRequest request) {
-        // Validation check for business rules (e.g., uniqueness, if required) would go here
+        // Validation check for business rules (e.g., uniqueness, if required)
         if (request == null) {
             throw new NullPointerException("BookRequest cannot be null");
         }

src/test/java/com/codesungrape/hmcts/BookAPI/BookServiceTest.java

@@ -10,16 +10,11 @@
 import org.junit.jupiter.params.provider.Arguments;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
 import org.mockito.junit.jupiter.MockitoExtension;
-import org.springframework.util.Assert;
 import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.CsvSource;
 import org.junit.jupiter.params.provider.MethodSource;
-import org.junit.jupiter.params.provider.Arguments;
 import java.util.stream.Stream;
 
-import java.util.Optional;
 import java.util.UUID;
 
 import static org.mockito.ArgumentMatchers.any;
@@ -171,7 +166,11 @@ void testCreateBook_RepositoryReturnsNull_HandlesGracefully() {
 
     @ParameterizedTest(name= "{0}") // Display the test name
     @MethodSource("provideLongFieldTestCases")
-    void testCreateBook_VeryLongFields_Success(String testName, BookRequest request, Book expectedBook) {
+    void testCreateBook_VeryLongFields_Success(
+            String testName,
+            BookRequest request,
+            Book expectedBook
+        ) {
 
         // Arrange
         when(testBookRepository.save(any(Book.class)))