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func func1() {
    s := time.Now()
    defer func(s time.Time) {
        e := time.Now()
        fmt.Println(e.Sub(s))
    }(s)
    buffer := bytes.Buffer{}
    for i:=0 ;i < 100000; i++ {
        buffer.WriteString(strconv.Itoa(i))
    }
    str := buffer.String()
    fmt.Println(len(str))
}