fix createMarks

src/main/java/com/StudentServices/MarksService/controller/StudentMarksController.java

@@ -25,8 +25,7 @@ public class StudentMarksController {
     // (POST) create studentmark
     @PostMapping("/studentMarks")
     public ResponseEntity<StudentMarks> createMarks(@RequestBody StudentMarks studentMarks) {
-        StudentMarks studentMarks1 = studentService.addStudent(studentMarks);
-        return ResponseEntity.ok().body(studentMarks1);
+        return ResponseEntity.ok(studentService.addStudent(studentMarks));
     }
 
     // (GET) find studentmark by id