text: let courseID = window.localStorage.getItem('courseID');
  courseID = courseID || null;
  
  function setCourseID(courseId) {
      courseID = courseId;
      window.localStorage.setItem('courseID', courseID);
  }
  function getCourseID() {
      return courseID;
  }
  
  export { setCourseID, getCourseID };
  