How rand SetString

Getting Help
1

How rand count in :

count, one := big.NewInt(0), big.NewInt(1)
count.SetString("100000000000000000000000", 10)
2

i found

    const charset = "0123456789"

var seededRand *rand.Rand = rand.New(
rand.NewSource(time.Now().UnixNano()))

func StringWithCharset(length int, charset string) string {

b := make([]byte, length)
for i := range b {
b[i] = charset[seededRand.Intn(len(charset))]
}
return string(b)
}

func String(length int) string {
return StringWithCharset(length, charset)
}

count := big.NewInt(0)
count.SetString(String(77), 10)
3

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