📍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>

proxy/README.md

@@ -49,10 +49,9 @@ public interface WizardTower {
   void enter(Wizard wizard);
 }
 
+@Slf4j
 public class IvoryTower implements WizardTower {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(IvoryTower.class);
-
   public void enter(Wizard wizard) {
     LOGGER.info("{} enters the tower.", wizard);
   }
@@ -81,10 +80,9 @@ public class Wizard {
 Then we have the `WizardTowerProxy` to add access control to `WizardTower`.
 
 ```java
+@Slf4j
 public class WizardTowerProxy implements WizardTower {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(WizardTowerProxy.class);
-
   private static final int NUM_WIZARDS_ALLOWED = 3;
 
   private int numWizards;