Solution for task 2 of challenge "Changing course"

public Map<String, Video> videosByTitle(Course course) {
    Map<String, Video> videoMap = new HashMap(); // Create a new Map, remember to import java.util.HashMap at the top of the file
    for(Video video : course.getVideos()) { // Loop though each of the Video objects in the course's Video list
        videoMap.put(video.getTitle(), video); // Add an entry to the map where the value is the title of the Video and the key the Video
    }
    return videoMap; // Return this new Map
}