docs: public static double blackScholesOptionValue(
  			double initialStockValue,
  			double riskFreeRate,
  			double volatility,
  			double optionMaturity,
  			double optionStrike,
  			boolean isCall)	{
  
  		double callValue = blackScholesOptionValue(initialStockValue, riskFreeRate, volatility, optionMaturity, optionStrike);
  		if(isCall) {
  			return callValue;
  		}
  		else {
  			double putValue = callValue - (initialStockValue-optionStrike *  Math.exp(-riskFreeRate * optionMaturity));
  			return putValue;
  		}
  	}