func randomStr(n int) string {
var l = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
rand.Seed(time.Now().UnixNano())
b := make([]rune, n)
length := len(l)
for i := range b {
b[i] = l[rand.Intn(length)]
}
return string(b)
}
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