I'm having my issues finding the right answer as this is non code related.
The checksum says: "If the total’s last digit is 0, the number is valid!"
This is a credit card number that is supposed to be valid: 4012 8888 8888 1881
The 16 digits are legit. But as you see in the picture, the checksum doesn't add up according to the description and hence my code marks it as invalid. Somehow, this is supposed to be a valid Visa Number and CS50 is showing me a wrong result.
What am I missing here?