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in this tutorial were going to learn how to create a validator for a credit card number using the LAN algorithm which is used to help validate credit card numbers we are given a positive integer of up to 16 digits return true if its a valid credit card number or false otherwise here is the algorithm double every other digit scanning from right to left starting from the second digit from the right so this one we have here a couple of examples so we understand how we need to do this another way to think about it is if there are an even number of digits double every other digit starting from the first so even number we start with the first one and then its third one if there is an odd number like in this case and we start with the second and four well start with the second and go the fourth and so on all right if a resulting number is greater than nine replace it with the sum of its own digits which is the same as subtracting 9 from it yes so basically if we have a number which is grea
