📍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>

lazy-loading/src/main/java/com/iluwatar/lazy/loading/App.java

@@ -23,8 +23,7 @@
 
 package com.iluwatar.lazy.loading;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Lazy loading idiom defers object creation until needed.
@@ -34,10 +33,9 @@ import org.slf4j.LoggerFactory;
  * <p>Additional information and lazy loading flavours are described in
  * http://martinfowler.com/eaaCatalog/lazyLoad.html
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *