refactor(exception): inner class exception to stand alone class

Author: Jiankai Zheng

src/main/java/spotify/exceptions/ResponseChecker.java

@@ -34,11 +34,4 @@ public static void throwIfRequestHasNotBeenFulfilledCorrectly(ResponseBody error
             throw new SpotifyActionFailedException(message);
         }
     }
-
-    private static class SpotifyActionFailedException extends RuntimeException {
-
-        public SpotifyActionFailedException(String message) {
-            super(message);
-        }
-    }
 }

src/main/java/spotify/exceptions/SpotifyActionFailedException.java

@@ -0,0 +1,7 @@
+package spotify.exceptions;
+
+public class SpotifyActionFailedException extends RuntimeException {
+    public SpotifyActionFailedException(String message) {
+        super(message);
+    }
+}