I'm stuck at the Video exercise. Please help me. Code inside.

package com.example.model;

import java.util.List;

public class Course {
  private String mName;
  private List<Video> mVideos; 

  public Course(String name, List<Video> videos) {
    mName = name;
    mVideos = videos;
  }

  public String getName() {
    return mName;
  }

  public List<Video> getVideos() {
    return mVideos;
  }

}

package com.example.model;

public class Video {
  private String mTitle;

  public Video(String title) {
    mTitle = title;
  }

  public String getTitle() {
    return mTitle;
  }

  public void setTitle(String title) {
    mTitle = title;
  }

}

import com.example.model.Course;
import com.example.model.Video;

import java.util.Map;
import java.util.List;
import java.util.ArrayList;
import java.util.HashMap;

public class QuickFix {

  public void addForgottenVideo(Course course) {

    Video video = new Video("The Beginning Bits");
    List<Video> videoList = new ArrayList<Video>();

    videoList = course.getVideos();
    videoList.add(1, video);



    // TODO(1):  Create a new video called "The Beginning Bits"

    // TODO(2):  Add the newly created video to the course videos as the second video.

  }

  public void fixVideoTitle(Course course, String oldTitle, String newTitle) {

    for(Map.Entry<String, Video> entry : videosByTitle) {

     String title = entry.getKey();

      if(title.equals(oldTitle)) {

        Object obj = entry.remove(title);
        entry.put(newTitle, obj);

      }






    }



  }

  public Map<String, Video> videosByTitle(Course course) {

    Map<String, Video> mapVideo = new HashMap<String, Video>();

    for(Video video: course.getVideos()) {

      mapVideo.put(video.getTitle(), video);

    }


    return mapVideo;


  }

}