Fix Function so that it Returns the Same Values as Indicator Provided

Should be a quick function to deliver.

NOTE: All the inputs in Index__Buffer are required

Fix the following function:

double Index__Buffer(              //if there are several indicators with different input parameters such as: sym, PERIOD, Period_Indicator, shift_Indicator, deviation, APPLIED_PRICE
                     string sym,                         //indicator symbol
                     ENUM_TIMEFRAMES PERIOD,             //timeframe of the indicator
                     int Period_Indicator,               //indicator period
                     int shift_Indicator,                //shift
                     double deviation,                   //deviation
                      //------------------------------------------------------------------------------------------
                     int index_buffer,                   //Buffer numbers: 0 - BASE_LINE, 1 - UPPER_BAND, 2 - LOWER_BAND
                     int index_Bar                       //indeh from which candle to take the data
                  )
{                  
     
double state = 0;     
     
static double SmoothPrice[];
static double SmoothRange[];     
     
//-------------------------------------------------------------------------------------------------------------------------------------
      
SmoothPrice[index_Bar] = (SmoothPrice[index_Bar+1]*(Period_Indicator-1)+ iClose(sym,PERIOD,index_Bar))/Period_Indicator;
SmoothRange[index_Bar] = (SmoothRange[index_Bar+1]*(Period_Indicator-1)+iHigh(sym,PERIOD,index_Bar)-iLow(sym,PERIOD,index_Bar))/Period_Indicator;
         
      
if(index_buffer==0)
{
state = SmoothPrice[index_Bar];
}
if(index_buffer==1)
{
state = SmoothPrice[index_Bar]+SmoothRange[index_Bar]*deviation;
}
if(index_buffer==2)
{
state = SmoothPrice[index_Bar]+SmoothRange[index_Bar]*deviation;
}
 
 return(state);
 
}

So that the inputs in the comments return the same as the indicator output

1) See it working with INDEX_IBANDS

2) Need it working with INDEX__BUFFER