📍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>

registry/src/test/java/com/iluwatar/registry/CustomerRegistryTest.java

@@ -59,9 +59,8 @@ public class CustomerRegistryTest {
   }
 
   @Test
-  public void shouldReturnNullWhenQueriedCustomerIsNotInRegistry() {
+  void shouldReturnNullWhenQueriedCustomerIsNotInRegistry() {
     Customer customerWithId5 = customerRegistry.getCustomer("5");
     assertNull(customerWithId5);
   }
-
 }