function iterateCryptoExchanges(cryptoExchanges, keyFunction) {
        for (let i = 0; i < cryptoExchanges.length; i++) {
            iterateExchanges(cryptoExchanges[i].exchanges, keyFunction)
        }
    }
@param {CryptoExchange[]} cryptoExchanges 
@param {(userKeys: Config[]) => void} keyFunction