 the beginning of the string in order to make its length 2. Finally, in <code>__str__</code>, we create a variable <code>
        result</code> that will contain the name of the playlist and the total duration of all the songs in the playlist. Next, we add
        the name and duration of each individual song to the <code>result</code> variable. Notice that we keep of track of the number
        of songs with the variable <code>song_num</code>; this varialbe will be used for the string representation of 