📍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>

object-pool/src/main/java/com/iluwatar/object/pool/App.java

@@ -23,8 +23,7 @@
 
 package com.iluwatar.object.pool;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * When it is necessary to work with a large number of objects that are particularly expensive to
@@ -44,10 +43,9 @@ import org.slf4j.LoggerFactory;
  * ObjectPool}. {@link Oliphaunt}s can be checked out from the pool and later returned to it. The
  * pool tracks created instances and their status (available, inUse).
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *

object-pool/src/test/java/com/iluwatar/object/pool/AppTest.java

@@ -26,7 +26,7 @@ package com.iluwatar.object.pool;
 import org.junit.jupiter.api.Test;
 
 /**
- * 
+ *
  * Application test
  *
  */

object-pool/src/test/java/com/iluwatar/object/pool/OliphauntPoolTest.java

@@ -23,26 +23,29 @@
 
 package com.iluwatar.object.pool;
 
-import org.junit.jupiter.api.Test;
+import static java.time.Duration.ofMillis;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTimeout;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.List;
-
-import static java.time.Duration.ofMillis;
-import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
 
 /**
  * Date: 12/27/15 - 1:05 AM
  *
  * @author Jeroen Meulemeester
  */
-public class OliphauntPoolTest {
+class OliphauntPoolTest {
 
   /**
    * Use the same object 100 times subsequently. This should not take much time since the heavy
    * object instantiation is done only once. Verify if we get the same object each time.
    */
   @Test
-  public void testSubsequentCheckinCheckout() {
+  void testSubsequentCheckinCheckout() {
     assertTimeout(ofMillis(5000), () -> {
       final var pool = new OliphauntPool();
       assertEquals("Pool available=0 inUse=0", pool.toString());
@@ -71,7 +74,7 @@ public class OliphauntPoolTest {
    * object instantiation is done only once. Verify if we get the same object each time.
    */
   @Test
-  public void testConcurrentCheckinCheckout() {
+  void testConcurrentCheckinCheckout() {
     assertTimeout(ofMillis(5000), () -> {
       final var pool = new OliphauntPool();
       assertEquals(pool.toString(), "Pool available=0 inUse=0");