Go语言通过Luhn算法验证信用卡卡号是否有效的方法

package main
import (
    "fmt"
    "strings"
)
const input = `49927398716
49927398717
1234567812345678
1234567812345670`
var t = [...]int{0,2,4,6,8,1,3,5,7,9}
func luhn(s string) bool {
    odd := len(s) & 1
    var sum int
    for i,c := range s {
        if c < '0' || c > '9' {
            return false
        }
        if i&1 == odd {
            sum += t[c-'0']
        } else {
            sum += int(c - '0')
        }
    }
    return sum%10 == 0
}
func main() {
    for _,s := range strings.Split(input,"n") {
        fmt.Println(s,luhn(s))
    }
}

49927398716 true
49927398717 false
1234567812345678 false
1234567812345670 true