create random string in golang

func rand_str(str_size int) string {
    alphanum := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" 
    var bytes = make([]byte, str_size)
    rand.Read(bytes)
    for i, b := range bytes {
        bytes[i] = alphanum[b%byte(len(alphanum))]
    }
    return string(bytes)
}
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