📍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>

dao/README.md

@@ -74,10 +74,9 @@ public class InMemoryCustomerDao implements CustomerDao {
   ...
 }
 
+@Slf4j
 public class DbCustomerDao implements CustomerDao {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(DbCustomerDao.class);
-
   private final DataSource dataSource;
 
   public DbCustomerDao(DataSource dataSource) {