code: public static BitfinexFundingSymbol funding(final String bitfinexCurrency) {
  		
          final String currencyNonNull = Objects.requireNonNull(bitfinexCurrency).toUpperCase();
          final BitfinexFundingCurrency currency = new BitfinexFundingCurrency(currencyNonNull);
          
  		return funding(currency);
  	}
docs: returns symbol for funding
  
  @param bitfinexCurrency
  @return