Fix checkstyle errors

src/Common/src/main/java/greenify/common/UserDTO.java

@@ -5,7 +5,6 @@ package greenify.common;
 // The motivation for its use is that communication between processes is usually done
 // resorting to remote interfaces (e.g., web services), where each call is an expensive operation.
 public class UserDto {
-
     private Long id;
     private String name;
 

src/Common/src/test/java/ErrorResponseTest.java

@@ -1,9 +1,10 @@
-import greenify.common.ErrorResponse;
-import org.junit.Test;
-
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import greenify.common.ErrorResponse;
+
+import org.junit.Test;
+
 public class ErrorResponseTest {
     @Test
     public void setAndGetTest() {

src/Common/src/test/java/UserDTOTest.java

@@ -1,9 +1,9 @@
-import greenify.common.UserDto;
-import org.junit.Test;
-
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import greenify.common.UserDto;
+import org.junit.Test;
+
 public class UserDtoTest {
     @Test
     public void setAndGetTest() {