module FFaker::IdentificationPL

def identity_card_checksum(letter_part, number_part)
  a, b, c = letter_part.codepoints.map { |codepoints| codepoints - 55 }
  d, e, f, g, h = number_part.split('').map(&:to_i)
  (a * 7 + b * 3 + c + 7 * d + 3 * e + f + 7 * g + 3 * h) % 10
end