// Perform the double alternate algorithm and return
// the remainder of the operation
func DoubleAlternate(b m.BankAccount, data m.SortCodeData, sum int) (remainder int) {
numbers := b.MergeAccountDetails()
weights := data.Weights
for i, nb := range numbers {
sum += helpers.AddDigits(weights[i] * nb)
}
remainder = sum % 10
return
}
// Perform the modulus algorithm with a given modulus
// and return the remainder of the operation
func Modulus(b m.BankAccount, modulus int, data m.SortCodeData) (remainder int) {
numbers := b.MergeAccountDetails()
sum := 0
weights := data.Weights
for i, nb := range numbers {
sum += weights[i] * nb
}
remainder = sum % modulus
return
}