Hi all. Perhaps a lazy request, but does anybody have some cut-n-paste code to 
calculate a Luhn check-digit?

It's a check-digit often added to the end of things like credit card or account 
numbers to make detecting typo's a bit easier.

I found lots of code to validate a number once the check-digit is applied, but 
nothing to calculate the digit in the first place.

Thanks in advance !

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