Optimized Exception handling for Deleting Accounts in PrivateBank.java

src/main/java/bank/PrivateBank.java

@@ -379,7 +379,7 @@ public class PrivateBank implements Bank, JsonSerializer<Transaction>, JsonDeser
             String filename = directoryName + "/" + account + ".json";
             File file = new File(filename);
             if (!file.delete())
-                throw new IOException();
+                throw new IOException("Datei des Accounts: " + account + " konnte nicht richtig gelöscht werden.");
         } else {
             throw new AccountDoesNotExistException();
         }