📍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>

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

@@ -23,8 +23,7 @@
 
 package com.iluwatar.composite;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * The Composite pattern is a partitioning design pattern. The Composite pattern describes that a
@@ -35,15 +34,14 @@ import org.slf4j.LoggerFactory;
  *
  * <p>In this example we have sentences composed of words composed of letters. All of the objects
  * can be treated through the same interface ({@link LetterComposite}).
- * 
+ *
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
-   * 
+   *
    * @param args command line args
    */
   public static void main(String[] args) {

composite/src/main/java/com/iluwatar/composite/Letter.java

@@ -23,17 +23,16 @@
 
 package com.iluwatar.composite;
 
+import lombok.RequiredArgsConstructor;
+
 /**
  * Letter.
  */
+@RequiredArgsConstructor
 public class Letter extends LetterComposite {
 
   private final char character;
 
-  public Letter(char c) {
-    this.character = c;
-  }
-
   @Override
   protected void printThisBefore() {
     System.out.print(character);

composite/src/test/java/com/iluwatar/composite/MessengerTest.java

@@ -23,22 +23,21 @@
 
 package com.iluwatar.composite;
 
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 /**
  * Date: 12/11/15 - 8:12 PM
  *
  * @author Jeroen Meulemeester
  */
-public class MessengerTest {
+class MessengerTest {
 
   /**
    * The buffer used to capture every write to {@link System#out}
@@ -54,7 +53,7 @@ public class MessengerTest {
    * Inject the mocked std-out {@link PrintStream} into the {@link System} class before each test
    */
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     this.stdOutBuffer = new ByteArrayOutputStream();
     System.setOut(new PrintStream(stdOutBuffer));
   }
@@ -63,7 +62,7 @@ public class MessengerTest {
    * Removed the mocked std-out {@link PrintStream} again from the {@link System} class
    */
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     System.setOut(realStdOut);
   }
 
@@ -71,7 +70,7 @@ public class MessengerTest {
    * Test the message from the orcs
    */
   @Test
-  public void testMessageFromOrcs() {
+  void testMessageFromOrcs() {
     final var messenger = new Messenger();
     testMessage(
         messenger.messageFromOrcs(),
@@ -83,7 +82,7 @@ public class MessengerTest {
    * Test the message from the elves
    */
   @Test
-  public void testMessageFromElves() {
+  void testMessageFromElves() {
     final var messenger = new Messenger();
     testMessage(
         messenger.messageFromElves(),