const (
    x_y int8 = iota
    x_star
    star_y
    star_star
)

type cell func([]string, []string)bool

func matchXY(a, b []string) bool {
    return a[0] == b[0] && a[1] == b[1]
}

func matchX(a, b []string) bool {
    return a[0] == b[0]
}

func matchY(a, b []string) bool {
    return a[1] == b[1]
}

func yes(a, b []string) bool {
    return true
}

func no(a, b []string) bool {
    return false
}

var (
    rules [4][4]cell = [4][4]cell {
        [4]cell{matchXY, matchX, matchY, yes},
        [4]cell{matchX, matchX, no, yes},
        [4]cell{matchY, no, matchY, yes},
        [4]cell{yes, yes, yes, yes},
    }
)

func kind(in []string)int8 {
    switch {
        case in[0] == "*" && in[1] == "*" : return star_star
        case in[0] == "*" : return star_y
        case in[1] == "*" : return x_star
        default : return x_y
    }
    return x_y
}

func match(required, provided string) (ok bool) {
    reqParts, provParts := strings.Split(required, "/"), strings.Split(provided, "/")
    if len(reqParts) == 2 && len(provParts) == 2{
        ok = rules[kind(reqParts)][kind(provParts)](reqParts,provParts)
    }
    return
}