📍Use lombok, reformat, and optimize the code (#1560)

* Use lombok, reformat, and optimize the code

* Fix merge conflicts and some sonar issues

Co-authored-by: va1m <va1m@email.com>

unit-of-work/README.md

@@ -83,8 +83,8 @@ public interface IUnitOfWork<T> {
   void commit();
 }
 
+@Slf4j
 public class StudentRepository implements IUnitOfWork<Student> {
-  private static final Logger LOGGER = LoggerFactory.getLogger(StudentRepository.class);
 
   private final Map<String, List<Student>> context;
   private final StudentDatabase studentDatabase;