📍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>

data-transfer-object/src/test/java/com/iluwatar/datatransfer/AppTest.java

@@ -29,15 +29,15 @@ import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
 class AppTest {
 
-    /**
-     * Issue: Add at least one assertion to this test case.
-     *
-     * Solution: Inserted assertion to check whether the execution of the main method in {@link App#main(String[])}
-     * throws an exception.
-     */
+  /**
+   * Issue: Add at least one assertion to this test case.
+   *
+   * Solution: Inserted assertion to check whether the execution of the main method in {@link App#main(String[])}
+   * throws an exception.
+   */
 
-    @Test
-    void shouldExecuteApplicationWithoutException() {
-        assertDoesNotThrow(() -> App.main(new String[]{}));
-    }
+  @Test
+  void shouldExecuteApplicationWithoutException() {
+    assertDoesNotThrow(() -> App.main(new String[]{}));
+  }
 }

data-transfer-object/src/test/java/com/iluwatar/datatransfer/customer/CustomerResourceTest.java

@@ -36,9 +36,10 @@ import org.junit.jupiter.api.Test;
 /**
  * tests {@link CustomerResource}.
  */
-public class CustomerResourceTest {
+class CustomerResourceTest {
+
   @Test
-  public void shouldGetAllCustomers() {
+  void shouldGetAllCustomers() {
     var customers = List.of(new CustomerDto("1", "Melody", "Yates"));
     var customerResource = new CustomerResource(customers);
     var allCustomers = customerResource.getAllCustomers();
@@ -50,7 +51,7 @@ public class CustomerResourceTest {
   }
 
   @Test
-  public void shouldSaveCustomer() {
+  void shouldSaveCustomer() {
     var customer = new CustomerDto("1", "Rita", "Reynolds");
     var customerResource = new CustomerResource(new ArrayList<>());
 
@@ -63,7 +64,7 @@ public class CustomerResourceTest {
   }
 
   @Test
-  public void shouldDeleteCustomer() {
+  void shouldDeleteCustomer() {
     var customer = new CustomerDto("1", "Terry", "Nguyen");
     var customers = new ArrayList<>(List.of(customer));
     var customerResource = new CustomerResource(customers);