complete the Student file

src/CourseRegistrationStarter/Student.java

@@ -21,19 +21,26 @@ public class Student {
     }
 
     public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
-        // Return true if registration was successful, otherwise false
+        if (c.getCapacity() > 0 ) {
+            registeredCourses.add(c);
+            c.reduceCapacity();
+            return true;
+        }
         return false;
     }
 
     public boolean dropCourse(Course c) {
-        // TODO: Remove the course from the student's list
-        // Restore the course capacity if removal was successful
-        // Return true if the course was dropped, otherwise false
+        if (registeredCourses.contains(c)) {
+            registeredCourses.remove(c);
+            c.increaseCapacity();
+            return true;
+        }
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        for (Course c : registeredCourses) {
+            System.out.println(c);
+        }
     }
 }