complete all TODO sections

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -9,16 +9,35 @@ public class RegistrationSystem {
     }
 
     public void addCourseToSystem(Course c) {
-        // TODO: Add the course to the system
+        courses.add(c);
     }
 
     public Course findCourseByCode(String code) {
-        // TODO: Search for a course by course code
-        // Return the matching course if found, otherwise return null
+        for (Course a : courses)
+        {
+            if (a.getCourseCode().equals(code))
+            {
+                return a;
+            }
+        }
+        return null;
+    }
+    public Course findCourseByName(String name)
+    {
+        for (Course a : courses)
+        {
+            if (a.getCourseName().equals(name))
+            {
+                return a;
+            }
+        }
         return null;
     }
 
     public void showAllCourses() {
-        // TODO: Print all courses in the system
+        for (Course c : courses)
+        {
+            System.out.println(c.getCourseName() + " - " + c.getCourseCode() + " - capacity: " + c.getCapacity());
+        }
     }
 }