fit: Add check for invalid inputs

Author: abdullyahuza

Recursive/Factorial.js

@@ -16,7 +16,7 @@ const factorial = (n) => {
  if ((n % 1) !== 0) {
  throw new RangeError('Not a Whole Number')
  }
- 
+
  if (n === 0) {
  return 1
  }