anchor.diff:              "username": "Request username",
           }
   
  -+ Response 412 (application/json)
  -
  -        {
  -            "message": "Failure",
  -            "username": "Request username"
  -        }
  -
  -
  -## HS Library [/library/studyrooms]
  ++ Response 400 (application/json)
  +
  +        {
  +            "message": "Failure",
  +            "username": "Request username"
  +        }
  +
  +
  +## HS Library [/library/hs]
   
   ### Get studyrooms of HS Library [POST]
   
  
positive.code:             "username": "Request username",
              "assignments": [
                  {
                      "sequencenum": "Sequence Number",
                      "title": "Title",
                      "detail": "Detail of the assignment",
                      "startdate": "Start date",
  
negative.code:             "username": "Request username",
              "existed": "true/false",
              "information": {
                  "studentnumber": Stundent number,
                  "department": "Department",
                  "position": "undergrate/master/doctor/teacher",
                  "email": "Email",
  