package main
import (
"fmt"
"os"
"strconv"
"crypto/rand"
"math/big"
"unicode"
"unsafe"
)
func main() {
num, err := strconv.ParseUint(os.Args[1],10,64)
if err != nil {
panic(err)
}
randrunes := make([]rune,num,num)
var char rune
for i := 0; uint64(i) < num; i++ {
nBig, err := rand.Int(rand.Reader,
big.NewInt(int64(unsafe.Sizeof(char))))
if err != nil {
panic(err)
}
char = rune(nBig.Int64())
if unicode.IsGraphic(char) {
randrunes[i] = char
} else {
if i == 0 {
continue
}
i--
}
}
fmt.Printf("%s\n",string(randrunes))
}
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