Talk is too slow Show me the code

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package main

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"math/rand"
	"time"
)

// 生成32位MD5
func MD5(text string) string {
	ctx := md5.New()
	ctx.Write([]byte(text))
	return hex.EncodeToString(ctx.Sum(nil))
}

// return len=8  salt
func GetRandomSalt() string {
	return GetRandomString(32)
}

//生成随机字符串
func GetRandomString(len int) string {
	str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	bytes := []byte(str)
	result := []byte{}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < len; i++ {
		result = append(result, bytes[r.Intn(62)])
	}
	return string(result)
}

//生成随机字符串小写
func GetRandomStringLow(l int) string {
	str := "0123456789abcdefghijklmnopqrstuvwxyz"
	bytes := []byte(str)
	result := []byte{}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < l; i++ {
		result = append(result, bytes[r.Intn(len(bytes))])
	}
	return string(result)
}

func main() {
	fmt.Println(GetRandomStringLow(10))
	fmt.Println(GetRandomString(10))
}

OUTPUT

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[Running] go run "/opt/gopath/src/test/golang/pwd/random.go"
58k92996a7
LXNppqnT0Y

[Done] exited with code=0 in 0.473 second