📍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/Java8Holder.java

@@ -24,17 +24,15 @@
 package com.iluwatar.lazy.loading;
 
 import java.util.function.Supplier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * This lazy loader is thread safe and more efficient than {@link HolderThreadSafe}. It utilizes
  * Java 8 functional interface {@link Supplier} as {@link Heavy} factory.
  */
+@Slf4j
 public class Java8Holder {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Java8Holder.class);
-
   private Supplier<Heavy> heavy = this::createAndCacheHeavy;
 
   public Java8Holder() {