Rewrites mult_add helper function
Rewrites Spain control number calculation
Rewrites austria validator checksum computation
Rewrites belgium validator checksum computation
Rewrites bulgaria validator checksum computation
Rewrites cyprus validator checksum computation
Rewrites denmark validator checksum computation
Rewrites Spain validator
Rewrites finland validator checksum computation
Rewrites united kingdom validator checksum computation
Rewrites greece validator checksum computation
Rewrites hungary validator checksum computation
Rewrites ireland validator checksum computation
Rewrites italy validator checksum computation