📍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>

converter/src/test/java/com/iluwatar/converter/ConverterTest.java

@@ -32,7 +32,7 @@ import org.junit.jupiter.api.Test;
 /**
  * Tests for {@link Converter}
  */
-public class ConverterTest {
+class ConverterTest {
 
   private final UserConverter userConverter = new UserConverter();
 
@@ -40,7 +40,7 @@ public class ConverterTest {
    * Tests whether a converter created of opposite functions holds equality as a bijection.
    */
   @Test
-  public void testConversionsStartingFromDomain() {
+  void testConversionsStartingFromDomain() {
     var u1 = new User("Tom", "Hanks", true, "tom@hanks.com");
     var u2 = userConverter.convertFromDto(userConverter.convertFromEntity(u1));
     assertEquals(u1, u2);
@@ -50,7 +50,7 @@ public class ConverterTest {
    * Tests whether a converter created of opposite functions holds equality as a bijection.
    */
   @Test
-  public void testConversionsStartingFromDto() {
+  void testConversionsStartingFromDto() {
     var u1 = new UserDto("Tom", "Hanks", true, "tom@hanks.com");
     var u2 = userConverter.convertFromEntity(userConverter.convertFromDto(u1));
     assertEquals(u1, u2);
@@ -61,7 +61,7 @@ public class ConverterTest {
    * instantiated allowing various different conversion strategies to be implemented.
    */
   @Test
-  public void testCustomConverter() {
+  void testCustomConverter() {
     var converter = new Converter<UserDto, User>(
         userDto -> new User(
             userDto.getFirstName(),
@@ -85,7 +85,7 @@ public class ConverterTest {
    * domain users returns an equal collection.
    */
   @Test
-  public void testCollectionConversion() {
+  void testCollectionConversion() {
     var users = List.of(
         new User("Camile", "Tough", false, "124sad"),
         new User("Marti", "Luther", true, "42309fd"),