fix: 选课码加密

src/main/java/nju/seec/helper/service/impl/CourseServiceImpl.java

@@ -56,7 +56,7 @@ public class CourseServiceImpl implements CourseService {
             throw HelperException.of(HelperException.ExceptionType.FORBIDDEN, "您无权修改该课程");
         }
         course.setName(modifyCourseDTO.getName())
-                .setCode(modifyCourseDTO.getCode())
+                .setCode(EncryptUtils.encode(modifyCourseDTO.getCode()))
                 .setBio(modifyCourseDTO.getBio())
                 .setCover(modifyCourseDTO.getCover());
         course = courseDAO.save(course);