type response struct {
    OK          bool        `json:"ok"`
    Description string      `json:"description"`
    Result      interface{} `json:"result"`
}

func (telegramBot *TelegramBot) makeRequest(request *http.Request) (error, interface{}) {
    resp, err := telegramBot.client.Do(request)
    if err != nil {
        return err, nil
    }
    defer resp.Body.Close()
    decoder := json.NewDecoder(resp.Body)
    respon := response{}
    decoder.Decode(&respon)
    if !respon.OK {
        return errors.New(respon.Description), nil
    }
    return nil,respon.Result
}