refactor: deleteunused variables, await with async calls

Author: semrosin

HwProj.APIGateway/HwProj.APIGateway.API/Filters/CourseMentorOrSolutionStudentAttribute.cs

@@ -49,9 +49,7 @@ public override async Task OnActionExecutionAsync(ActionExecutingContext context
 
         if (courseUnitType == "Solution")
         {
-            string? studentId = null;
-            
-            HashSet<string> studentIds = [];
+            var studentIds = new HashSet<string>();
             if (courseId != -1)
             {
                 var solution = await _solutionsServiceClient.GetSolutionById(courseUnitId);

HwProj.APIGateway/HwProj.APIGateway.API/Filters/SolutionPrivacyAttribute.cs

@@ -1,3 +1,4 @@
+namespace HwProj.APIGateway.API.Filters;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -9,8 +10,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 
-namespace HwProj.APIGateway.API.Filters;
-
 public class SolutionPrivacyAttribute : ActionFilterAttribute
 {
     private readonly ICoursesServiceClient _coursesServiceClient;
@@ -62,11 +61,11 @@ public override async Task OnActionExecutionAsync(ActionExecutingContext context
             courseUnitId = fileScopeDto.CourseUnitId;
         }
 
-        if (courseUnitType == "Homework") next.Invoke();
+        if (courseUnitType == "Homework") await next.Invoke();
 
         if (userRole == Roles.StudentRole)
         {
-            HashSet<string> studentIds = [];
+            var studentIds = new HashSet<string>();
             if (courseId != -1)
             {
                 var solution = await _solutionsServiceClient.GetSolutionById(courseUnitId);