Add student tag inside

work1/single.c

@@ -13,6 +13,12 @@ struct course_tag {
     float avg;
 };
 
+struct student_tag {
+    struct person_tag student_info;
+    struct course_tag course_info;
+    struct student_tag *next;
+}
+
 void display_students(void);
 void search_student(void);
 void find_maximum(void);