(double-digit->single-digit number)
Transforms double digit number into single digit
Transforms double digit number into single digit
(double-every-second-digit index value)
Doubles every second digit element
Doubles every second digit element
(has-invalid-chars? string)
Checks for any characters other than digits
Checks for any characters other than digits
(str->int string)
Transforms string into integer
Transforms string into integer
(valid-number? string)
Checks if a filtered number is valid
Checks if a filtered number is valid
(valid? string)
Validate a string using the Luhn algorithm
Validate a string using the Luhn algorithm
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