feat: service en controller laag voor getStudent geimplementeerd

backend/src/services/students.ts

@@ -0,0 +1,18 @@
+import { getStudentRepository } from "../data/repositories";
+import { StudentDTO } from "../interfaces/students";
+
+export async function getStudentById(username: string): Promise<StudentDTO | null> {
+    const studentRepository = getStudentRepository();
+    const student = await studentRepository.findByUsername(username);
+
+    if (!student) return null;
+    else {
+        return {
+            id: student.username,
+            username: student.username,
+            firstName: student.firstName,
+            lastName: student.lastName,
+        }
+    }
+}
+