📍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>

leader-followers/src/test/java/com/AppTest.java

@@ -26,18 +26,17 @@ package com;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
 import com.iluwatar.leaderfollowers.App;
+
 import org.junit.jupiter.api.Test;
 
 /**
- *
  * Application test
- *
  */
 class AppTest {
 
-    @Test
-    void shouldExecuteApplicationWithoutException() {
-        assertDoesNotThrow(() -> App.main(new String[]{}));
-    }
+  @Test
+  void shouldExecuteApplicationWithoutException() {
+    assertDoesNotThrow(() -> App.main(new String[]{}));
+  }
 
 }