fix: integratie user + errors gefixt zodat het runt + format

backend/src/interfaces/teacher.ts

@@ -1,36 +0,0 @@
-import { Teacher } from "../entities/users/teacher.entity.js";
-
-/**
- * Teacher Data Transfer Object
- */
-export interface TeacherDTO {
-    username: string;
-    firstName: string;
-    lastName: string;
-    endpoints?: {
-        self: string;
-        classes: string;
-        questions: string;
-        invitations: string;
-    };
-}
-
-/**
- * Maps a Teacher entity to a TeacherDTO
- */
-export function mapToTeacherDTO(teacher: Teacher): TeacherDTO {
-    return {
-        username: teacher.username,
-        firstName: teacher.firstName,
-        lastName: teacher.lastName,
-    };
-}
-
-export function mapToTeacher(teacherData: TeacherDTO): Teacher {
-    const teacher = new Teacher();
-    teacher.username = teacherData.username;
-    teacher.firstName = teacherData.firstName;
-    teacher.lastName = teacherData.lastName;
-
-    return teacher;
-}