fix: merge errors

backend/src/controllers/error-helper.ts

@@ -1,4 +1,4 @@
-import { BadRequestException } from '../exceptions.js';
+import {BadRequestException} from "../exceptions/bad-request-exception";
 
 /**
  * Checks for the presence of required fields and throws a BadRequestException

backend/src/controllers/students.ts

@@ -7,8 +7,7 @@ import {
     getStudent,
     getStudentAssignments,
     getStudentClasses,
-    getStudentGroups,
-    getStudentQuestions,
+    getStudentGroups, getStudentQuestions,
     getStudentSubmissions,
 } from '../services/students.js';
 import { StudentDTO } from '../interfaces/student.js';