anchor.diff:          {
               "message": "Success",
               "username": "Request username",
  -            "existed": "true/false",
  +            "existed": true/false,
               "information": {
                   "studentnumber": Stundent number,
                   "department": "Department",
  
positive.code:                 {
                      "coursid": "Course ID",
                      "coursename": "Course name",
                      "time": "[[1 to 7,1 to 6]]",
                      "teacher": "Teacher",
                      "classroom": "Classroom"
                  }
  
negative.code:                 {
                      "coursid": "Course ID",
                      "coursename": "Course name",
                      "time": [1 to 7,1 to 6],
                      "teacher": "Teacher",
                      "classroom": "Classroom",
                      "weeks": array of 0/1 whose length equals 16
                  }
              ]
          }
  