📍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-buffer/src/main/java/com/iluwatar/doublebuffer/App.java

@@ -24,9 +24,8 @@
 package com.iluwatar.doublebuffer;
 
 import java.util.List;
+import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.tuple.MutablePair;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Double buffering is a term used to describe a device that has two buffers. The usage of multiple
@@ -35,10 +34,9 @@ import org.slf4j.LoggerFactory;
  * separate frame is being buffered to be shown next. This method makes animations and games look
  * more realistic than the same done in a single buffer mode.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program main entry point.
    *

double-buffer/src/main/java/com/iluwatar/doublebuffer/Pixel.java

@@ -28,12 +28,6 @@ package com.iluwatar.doublebuffer;
  */
 public enum Pixel {
 
-  WHITE(0),
-  BLACK(1);
-
-  private final int color;
-
-  Pixel(int color) {
-    this.color = color;
-  }
+  WHITE,
+  BLACK;
 }

double-buffer/src/main/java/com/iluwatar/doublebuffer/Scene.java

@@ -24,17 +24,15 @@
 package com.iluwatar.doublebuffer;
 
 import java.util.List;
+import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.tuple.Pair;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Scene class. Render the output frame.
  */
+@Slf4j
 public class Scene {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Scene.class);
-
   private final Buffer[] frameBuffers;
 
   private int current;

double-buffer/src/test/java/com/iluwatar/doublebuffer/AppTest.java

@@ -34,7 +34,7 @@ class AppTest {
 
   /**
    * Issue: Add at least one assertion to this test case.
-   *
+   * <p>
    * Solution: Inserted assertion to check whether the execution of the main method in {@link App#main(String[])}
    * throws an exception.
    */