func isCusip(s) {
    if s.Length() != 9 { return false }
    var sum = 0
    for i in 0..7 {
        var c = s[i]
        var v =
            match c {
                '0'..'9' => c.Order() - 48,
                'A'..'Z' => c.Order() - 55,
                '*' => 36,
                '@' => 37,
                '#' => 38,
                _ => false
            }
        if i % 2 == 1 { v *= 2 }
        sum += v / 10 + v % 10
    }
    s[8].Order() - 48 == (10 - (sum % 10)) % 10
}

var candidates = [
    "037833100",
    "17275R102",
    "38259P508",
    "594918104",
    "68389X106",
    "68389X105"
]

for candidate in candidates {
    var b =
        if isCusip(candidate) {
            "correct"
        } else {
            "incorrect"
        }
    print("\(candidate) -> \(b)")
}