fixed the code style error

Author: Syed Fasiuddin

String/AlphaNumericPalindrome.js

@@ -49,7 +49,7 @@ const alphaNumericPlaindrome = (str) => {
  }
 
  // if the string is palindrome then palin variable is never changed
- if (palin == 0) return true
+ if (palin === 0) return true
  else return false
 }