code: public static BitfinexExecutedTradeSymbol executedTrades(final String currency, 
      		final String profitCurrency) {
      	
          final String currencyNonNull = Objects.requireNonNull(currency).toUpperCase();
          final String profitCurrencyNonNull = Objects.requireNonNull(profitCurrency).toUpperCase();
          
          return executedTrades(BitfinexCurrencyPair.of(currencyNonNull, profitCurrencyNonNull));
      }
docs: Returns symbol for candlestick channel
  
  @param currency       of trades channel
  @param profitCurrency of trades channel
  @return symbol