📍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>

callback/README.md

@@ -54,10 +54,9 @@ public abstract class Task {
   public abstract void execute();
 }
 
+@Slf4j
 public final class SimpleTask extends Task {
 
-  private static final Logger LOGGER = getLogger(SimpleTask.class);
-
   @Override
   public void execute() {
     LOGGER.info("Perform some important activity and after call the callback method.");