fix: correctly implemented work into lesson 16

Author: JEKLUND251

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/justins_playlist/com/codedifferently/lesson16/Justins/com/codedifferently/lesson16/justinsplaylist/playlist.java renamed to lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/justins_playlist/Playlist

@@ -1,15 +1,15 @@
-package com.codedifferently.lesson16.justinsplaylist;
+package com.codedifferently.lesson16.justins_playlist;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class playlist {
+public class Playlist {
     private String name;
     private String genre;
     private int duration;
     private List<String> songs;
 
-    public playlist(String name, String genre, int duration) {
+    public Playlist(String name, String genre, int duration) {
         this.name = name;
         this.genre = genre;
         this.duration = duration;
@@ -30,7 +30,14 @@ public String getDetails() {
         return "Name: " + name + ", Genre: " + genre + ", Duration: " + duration;
     }
 
-    
-        
-    
+    public void addSong(String song) {
+        if (song == null || song.isEmpty()) {
+            throw new IllegalArgumentException("Song cannot be null or empty");
+        }
+        songs.add(song);
+    }
+
+    public List<String> getSongs() {
+        return songs;
+    }
 }

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/justins_playlist/playlistexception.java renamed to lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/justins_playlist/PlaylistExceptions

@@ -1,4 +1,4 @@
-package com.codedifferently.lesson16.JustinsPylaylist;
+package com.codedifferently.lesson16.justins_playlist;
 
 import java.util.ArrayList;
 import java.util.List;

lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/playlist.test/playlistexceptionTest.java renamed to lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/playlist.test/PlaylistExceptionsTest

@@ -7,7 +7,7 @@
 
 public class PlaylistTest {
 
-    private playlist playlist;
+    private Playlist playlist;
 
     @BeforeEach
     public void setUp() {