L74UCJF662QX7UJ3OLOHFQ7YYQDA2JAZTK2SVYHDZRYBCNVJOIQQC
WSJOKMIKHANHS7DGMSRXXZ2OLQCJSSNAIB4KY5JAZY7XN7BVXW7AC
MVKIA5LJ23UHEYNGXVAFE32GCNBGTCAWIBCRLSVJ52AVQXOPPEOAC
return luhn(input)%10 == 0}func luhn(input string) int {
return luhn(input)%10 == 0
}
func luhn(input string) int {
return 1
return false
return sum % 10
return sum%10 == 0