static func isJumin(front: String, rear: String) -> Bool{
if front.length < 6 {
return false
}
if rear.length < 7 {
return false
}
var chk = 0
for i in 0..<6 {
var str: String = substring(text: front, start: i, end: i+1)
chk = chk + (((i % 8) + 2) * Int(str)!)
}
for i in 6..<12 {
var str: String = substring(text: rear, start: i-6, end: i-5)
chk = chk + (((i % 8) + 2) * Int(str)!)
}
chk = 11 - (chk % 11)
chk = chk % 10
if (chk != Int(substring(text: rear, start: 6, end: 7))) {
return false
}
return true
}