fix pointer error

internal/user/service.go

@@ -46,7 +46,8 @@ func (s *Service) GetUsers() (Users, error) {
 	if !s.isInitialized() {
 		return nil, fmt.Errorf("user service is not initialized")
 	}
-	return s.store.GetUsers()
+	users, err := s.store.GetUsers()
+	return *users, err
 }
 
 func (s *Service) GetBy(by, value string) (*User, error) {