📍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>

double-dispatch/src/main/java/com/iluwatar/doubledispatch/App.java

@@ -24,8 +24,7 @@
 package com.iluwatar.doubledispatch;
 
 import java.util.List;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * When a message with a parameter is sent to an object, the resultant behaviour is defined by the
@@ -46,10 +45,9 @@ import org.slf4j.LoggerFactory;
  * coordinates. If there is an overlap, then the objects collide utilizing the Double Dispatch
  * pattern.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *