fix(curriculum): music player formatting (#55404)

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/655485321913feabbc5f00f8.md

@@ -651,7 +651,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555d458687cb3b357834df9.md

@@ -657,7 +657,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555dd138e70cae6b546966d.md

@@ -654,7 +654,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555de565387a2efe90a6ccc.md

@@ -662,7 +662,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555e04aeb225bfbae237344.md

@@ -643,7 +643,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555e0bfe4d69904410f7cd3.md

@@ -661,7 +661,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555e57d3e6d9d221c4735be.md

@@ -651,7 +651,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6555e6cec786da2aadc11ea0.md

@@ -667,7 +667,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/65572399a8e16d50bc2c1ff3.md

@@ -667,7 +667,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/655724bac464795a0ad91082.md

@@ -643,7 +643,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/65572bb34a7e488224b937fc.md

@@ -671,7 +671,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/65572e5aaf022790fb4a81b1.md

@@ -655,7 +655,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/65573a97c59ddbbf028ca95e.md

@@ -667,7 +667,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/6557421eb6a7a0f0500e3106.md

@@ -641,7 +641,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/655b4c8f636d9675953a0388.md

@@ -624,7 +624,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-basic-string-and-array-methods-by-building-a-music-player/655b4dad1d38ff7cdd65cbfe.md

@@ -665,7 +665,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();
@@ -1451,7 +1451,7 @@ const playNextSong = () => {
   }
 };
 
-const playPreviousSong = () =>{
+const playPreviousSong = () => {
    if (userData?.currentSong === null) return;
    else {
     const currentSongIndex = getCurrentSongIndex();