Fix method to get last 4 digits of card number

Author: Alex-Os-Dev-Lab

Sprint-1/2-mandatory-errors/3.js

@@ -1,5 +1,5 @@
 const cardNumber = "4533787178994213";
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.tostring().slice(-4);
 
 console.log(last4Digits);