func RandString(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = CHA[rand.Intn(len(CHA))]
	}
	return string(b)
}
RandString n is the length. a-z 0-9
package util
import (
	"bufio"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"math/rand"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"github.com/fatih/color"
)
const CHA = "abcdefghijklmnopqrstuvwxyz0123456789"