public function exchange($price, $baseCurrency, $toBeExchanged)
    {
        $formatted = number_format($this->list[$baseCurrency->getCode()]->getExchangeRates()[$toBeExchanged->getCode()]->getRate(),2);
        $a = $price * $formatted;
        return round($a); // Gecici cozum dönen değeri yuvarladık 100.23 => 100
 
    }