📍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>

multiton/src/main/java/com/iluwatar/multiton/App.java

@@ -23,8 +23,7 @@
 
 package com.iluwatar.multiton;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Whereas Singleton design pattern introduces single globally accessible object the Multiton
@@ -38,10 +37,9 @@ import org.slf4j.LoggerFactory;
  * <p>In the enum implementation {@link NazgulEnum} is the multiton. It is static and mutable
  * because of the way java supports enums.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *

multiton/src/test/java/com/iluwatar/multiton/AppTest.java

@@ -31,7 +31,7 @@ import org.junit.jupiter.api.Test;
 public class AppTest {
 
   @Test
-  public void test() {
+  void test() {
     App.main(new String[]{});
   }
 }

multiton/src/test/java/com/iluwatar/multiton/NazgulEnumTest.java

@@ -23,7 +23,7 @@
 
 package com.iluwatar.multiton;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertSame;
 
 import org.junit.jupiter.api.Test;
 
@@ -34,11 +34,11 @@ import org.junit.jupiter.api.Test;
 class NazgulEnumTest {
 
   /**
-   * Check that multiple calls to any one of the instances in the multiton returns 
+   * Check that multiple calls to any one of the instances in the multiton returns
    * only that one particular instance, and do that for all instances in multiton
    */
   @Test
-  public void testTheSameObjectIsReturnedWithMultipleCalls() {
+  void testTheSameObjectIsReturnedWithMultipleCalls() {
     for (var i = 0; i < NazgulEnum.values().length; i++) {
       var instance1 = NazgulEnum.values()[i];
       var instance2 = NazgulEnum.values()[i];

multiton/src/test/java/com/iluwatar/multiton/NazgulTest.java

@@ -23,12 +23,12 @@
 
 package com.iluwatar.multiton;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertSame;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * Date: 12/22/15 - 22:28 AM
  *
@@ -40,7 +40,7 @@ public class NazgulTest {
    * Verify if {@link Nazgul#getInstance(NazgulName)} returns the correct Nazgul multiton instance
    */
   @Test
-  public void testGetInstance() {
+  void testGetInstance() {
     for (final var name : NazgulName.values()) {
       final var nazgul = Nazgul.getInstance(name);
       assertNotNull(nazgul);