You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sign.go
    path of file: ./repos/clickvisual/api/internal/service/alarm/pusher/feishu
    
    the code of the file until where you have to start completion: // Package feishu  @Author arthur  09:49:00
package feishu

import (
	"strconv"
	"time"
)

// Sign 签名
type Sign struct {
	Timestamp string `js
    
func NewSign(secret string) *Sign {
	timestamp := strconv.FormatInt(time.Now().Unix(), 10)
	sign := GenSign(secret, timestamp)
	return &Sign{
		Timestamp: timestamp,
		Sign:      sign,
	}
}