correct error

Author: pathywang

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

@@ -1,6 +1,3 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
-
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Before running the code, make and explain a prediction about why the code won't work