Fix sonar cloud code smells

src/main/java/com/productdock/adapter/in/web/DeleteBookApi.java

@@ -13,7 +13,7 @@
 public record DeleteBookApi(DeleteBookUseCase deleteBookUseCase) {
 
     @DeleteMapping("/{bookId}")
-    public void DeleteBook(@PathVariable("bookId") Long bookId){
+    public void deleteBook(@PathVariable("bookId") Long bookId){
         log.debug("DELETE request recieved with book id: {}", bookId);
         deleteBookUseCase.deleteBook(bookId);
     }

src/main/java/com/productdock/adapter/out/kafka/DeletedBookMessagePublisher.java

@@ -1,13 +1,9 @@
 package com.productdock.adapter.out.kafka;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
-import com.productdock.adapter.out.kafka.mapper.AddedBookMessageMapper;
 import com.productdock.adapter.out.kafka.publisher.KafkaPublisher;
-import com.productdock.application.port.out.messaging.BookCatalogMessagingOutPort;
 import com.productdock.application.port.out.messaging.DeleteBookMessagingOutPort;
-import com.productdock.domain.Book;
 import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Component;
 

src/main/java/com/productdock/application/port/out/messaging/DeleteBookMessagingOutPort.java

@@ -1,7 +1,6 @@
 package com.productdock.application.port.out.messaging;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
-import com.productdock.domain.Book;
 
 import java.util.concurrent.ExecutionException;
 

src/main/java/com/productdock/application/service/DeleteBookService.java

@@ -45,7 +45,6 @@ private String createRentalMessage(BookRentalStateDto bookRentals){
         }
         String status = bookRentals.status().toString().toLowerCase();
         String userName = bookRentals.user().fullName();
-        String message = "Book is " + status + " by " + userName + ".";
-        return message;
+        return "Book is " + status + " by " + userName + ".";
     }
 }

src/test/java/com/productdock/adapter/in/web/DeleteBookApiShould.java

@@ -22,7 +22,7 @@ public class DeleteBookApiShould {
     @Test
     void deleteBook(){
 
-        deleteBookApi.DeleteBook(DEFAULT_BOOK_ID);
+        deleteBookApi.deleteBook(DEFAULT_BOOK_ID);
 
         verify(deleteBookUseCase).deleteBook(DEFAULT_BOOK_ID);
     }

src/test/java/com/productdock/application/service/DeleteBookServiceShould.java

@@ -23,7 +23,7 @@
 import static org.mockito.Mockito.verify;
 
 @ExtendWith(MockitoExtension.class)
-public class DeleteBookServiceShould {
+class DeleteBookServiceShould {
 
     private static final UserProfileDto USER_PROFILE_DTO = new UserProfileDto("Mocked name", null, null);
     private static final BookRentalStateDto RENTAL_DTO = new BookRentalStateDto(USER_PROFILE_DTO, null, null);