refactor: minor style improvements

src/main/java/com/application/munera/repositories/ExpenseRepository.java

@@ -2,13 +2,11 @@ package com.application.munera.repositories;
 
 
 import com.application.munera.data.Expense;
-import com.application.munera.data.Person;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
-import java.util.Collection;
 import java.util.Set;
 
 public interface ExpenseRepository extends JpaRepository<Expense, Long>, JpaSpecificationExecutor<Expense> {

src/main/java/com/application/munera/services/CategoryService.java

@@ -26,8 +26,8 @@ public class CategoryService {
         return categoryRepository.findAll();
     }
 
-    public Category update(Category category) {
-        return categoryRepository.save(category);
+    public void update(Category category) {
+        categoryRepository.save(category);
     }
 
     public void delete(Category category) {

src/main/java/com/application/munera/services/ExpenseService.java

@@ -34,8 +34,8 @@ public class ExpenseService {
     }
     public List<Expense> findAll() {return repository.findAll();}
 
-    public Expense update(Expense entity) {
-        return repository.save(entity);
+    public void update(Expense entity) {
+        repository.save(entity);
     }
 
     public void delete(Long id) {

src/main/java/com/application/munera/services/PersonService.java

@@ -31,8 +31,8 @@ public class PersonService {
         return this.personRepository.findAll();
     }
 
-    public Person update(Person person) {
-        return this.personRepository.save(person);
+    public void update(Person person) {
+        this.personRepository.save(person);
     }
 
     public void delete(Long id) {

src/main/java/com/application/munera/views/MainLayout.java

@@ -60,9 +60,8 @@ public class MainLayout extends AppLayout {
     }
 
     private Footer createFooter() {
-        Footer layout = new Footer();
 
-        return layout;
+        return new Footer();
     }
 
     @Override