fix: extract last 4 digits using type conversion

Author: arunkumarakilan

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

@@ -1,5 +1,5 @@
-const cardNumber = "4533787178994213";
-const last4Digits =  cardNumber.slice(-4);
+const cardNumber = 4533787178994213;
+const last4Digits = Number(String(cardNumber).slice(-4));
 console.log(last4Digits);
 
 // The last4Digits variable should store the last 4 digits of cardNumber