Refactor function to remove nested error handling

lib/music_library/artists.ex

@@ -46,19 +46,14 @@ defmodule MusicLibrary.Artists do
   end
 
   def fetch_artist_info(artist_id) do
-    case MusicBrainz.get_artist(artist_id) do
+    with {:ok, musicbrainz_artist} <- MusicBrainz.get_artist(artist_id) do
-      {:ok, musicbrainz_artist} ->
       if discogs_id = MusicBrainz.Artist.get_discogs_id(musicbrainz_artist) do
-          case Discogs.get_artist(discogs_id) do
+        with {:ok, discogs_artist} <- Discogs.get_artist(discogs_id) do
-            {:ok, discogs_artist} ->
           create_artist_info(%{
             id: musicbrainz_artist.id,
             musicbrainz_data: musicbrainz_artist.musicbrainz_data,
             discogs_data: discogs_artist
           })
-
-            error ->
-              error
         end
       else
         create_artist_info(%{
@@ -66,9 +61,6 @@ defmodule MusicLibrary.Artists do
           musicbrainz_data: musicbrainz_artist.musicbrainz_data
         })
       end
-
-      error ->
-        error
     end
   end