public Shortener(string url)
{
var urls = new LiteDatabase(@"Filename=URL_DATABASE.db; Connection=shared").GetCollection <ZavorURL>();
_url = new ZavorURL()
{
Token = GenerateToken(), URL = url, ShortenedURL = _baseUrl + Token
};
if (urls.Exists(u => u.URL == url))
{
throw new Exception("URL already exists");
}
urls.Insert(_url);
}