diff --git a/internal/services/contest.go b/internal/services/contest.go
index 4859133..09df616 100644
--- a/internal/services/contest.go
+++ b/internal/services/contest.go
@@ -30,21 +30,21 @@ func (service *ContestService) CreateContest(ctx context.Context, contest *model
 	return service.contestStorage.CreateContest(ctx, contest)
 }
 
-func ReadContestById(ctx context.Context, id int32) (*models.Contest, error) {
+func (service *ContestService) ReadContestById(ctx context.Context, id int32) (*models.Contest, error) {
 	userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
-	return service.contestStorage.ReadContestById(ctx, contest)
+	return service.contestStorage.ReadContestById(ctx, id)
 }
 
-func UpdateContest(ctx context.Context, contest *models.Contest) error {
+func (service *ContestService) UpdateContest(ctx context.Context, contest *models.Contest) error {
 	userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
 	return service.contestStorage.UpdateContest(ctx, contest)
 }
 
-func DeleteContest(ctx context.Context, id int32) error {
+func (service *ContestService) DeleteContest(ctx context.Context, id int32) error {
 	userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
-	return service.contestStorage.DeleteContest(ctx, contest)
+	return service.contestStorage.DeleteContest(ctx, id)
 }
 
diff --git a/internal/services/problem.go b/internal/services/problem.go
index 370ff91..96fc857 100644
--- a/internal/services/problem.go
+++ b/internal/services/problem.go
@@ -30,21 +30,21 @@ func (service *ProblemService) CreateProblem(ctx context.Context, problem *model
 	return service.problemStorage.CreateProblem(ctx, problem)
 }
 
-func ReadProblemById(ctx context.Context, id int32) (*models.Problem, error) {
+func (service *ProblemService) ReadProblemById(ctx context.Context, id int32) (*models.Problem, error) {
 	userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
-	return service.problemStorage.ReadProblemById(ctx, problem)
+	return service.problemStorage.ReadProblemById(ctx, id)
 }
 
-func UpdateProblem(ctx context.Context, problem *models.Problem) error {
+func (service *ProblemService) UpdateProblem(ctx context.Context, problem *models.Problem) error {
 	userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
 	return service.problemStorage.UpdateProblem(ctx, problem)
 }
 
-func DeleteProblem(ctx context.Context, id int32) error {
+func (service *ProblemService) DeleteProblem(ctx context.Context, id int32) error {
 	userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
-	return service.problemStorage.DeleteProblem(ctx, problem)
+	return service.problemStorage.DeleteProblem(ctx, id)
 }
 
diff --git a/internal/services/task.go b/internal/services/task.go
index dcfab65..34cc538 100644
--- a/internal/services/task.go
+++ b/internal/services/task.go
@@ -28,7 +28,7 @@ func (service *TaskService) CreateTask(ctx context.Context, task models.Task) (i
     return service.taskStorage.CreateTask(ctx, task)
 }
 
-func DeleteTask(ctx context.Context, id int32) error {
+func (service *TaskService) DeleteTask(ctx context.Context, id int32) error {
     userId := ctx.Value("user_id").(int32)
     panic("access control is not implemented yet")
     return service.taskStorage.DeleteTask(ctx, id)