📍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>

trampoline/src/main/java/com/iluwatar/trampoline/TrampolineApp.java

@@ -23,8 +23,7 @@
 
 package com.iluwatar.trampoline;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Trampoline pattern allows to define recursive algorithms by iterative loop.
@@ -33,17 +32,16 @@ import org.slf4j.LoggerFactory;
  * and to interleave the execution of functions without hard coding them together or even using
  * threads.
  */
+@Slf4j
 public class TrampolineApp {
 
-  private static final Logger log = LoggerFactory.getLogger(TrampolineApp.class);
-
   /**
    * Main program for showing pattern. It does loop with factorial function.
    */
   public static void main(String[] args) {
-    log.info("start pattern");
+    LOGGER.info("start pattern");
     var result = loop(10, 1).result();
-    log.info("result {}", result);
+    LOGGER.info("result {}", result);
 
   }
 

trampoline/src/test/java/com/iluwatar/trampoline/TrampolineAppTest.java

@@ -30,11 +30,10 @@ import org.junit.jupiter.api.Test;
 /**
  * Test for trampoline pattern.
  */
-public class TrampolineAppTest {
-
+class TrampolineAppTest {
 
   @Test
-  public void testTrampolineWithFactorialFunction() {
+  void testTrampolineWithFactorialFunction() {
     long result = TrampolineApp.loop(10, 1).result();
     assertEquals(3_628_800, result);
   }