📍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>

leader-election/src/test/java/com/iluwatar/leaderelection/MessageTest.java

@@ -23,23 +23,23 @@
 
 package com.iluwatar.leaderelection;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * Message test case.
  */
 public class MessageTest {
 
   @Test
-  public void testGetType() {
+  void testGetType() {
     var message = new Message(MessageType.HEARTBEAT, "");
     assertEquals(MessageType.HEARTBEAT, message.getType());
   }
 
   @Test
-  public void testGetContent() {
+  void testGetContent() {
     var content = "test";
     var message = new Message(MessageType.HEARTBEAT, content);
     assertEquals(content, message.getContent());