Code that is able to Work More Efficiently with Multi Symbol

Attached below you will see the following:

• ibbfill2(1) - indicator code that is the source indicator that I am using (use this to test if it is working)
• Test_BB2 - indicator code converted into an Expert Advisor format so I do not need to use iCustom

The outcome that I want is Test_BB2 to be converted into code that is as lean as possible. I still need to sustain the key functionality of he indicator, but I need to to work much better (I will use this code and put it into an expert advisor - currently it is too slow when backtesting with this implementation so I need this adjusted ASAP).

void prices(string symb)
{

static bool downTrend2[12] = {false};
static bool flatTrend2[12] = {false};
static bool upTrend2[12] = {false};

        int symbolIndex = -1;
//Removed Symbol 1 , 5, 12, 8, 9        
        
    string symbol_s[] = {symb1, symb2, symb3, symb4, symb5, symb6, symb7, symb8, symb9, symb10, symb11, symb12};

    for (int i = 0; i < 12; i++)
    {
        if (symb == symbol_s[i])
        {
            symbolIndex = i;
            break;
        }
    }

   ArraySetAsSeries(ibValue, true);
   ArraySetAsSeries(ibbLower, true);
   ArraySetAsSeries(ibbUpper, true);
   ArraySetAsSeries(ibbMain, true);

       if(symbolIndex >=0 && newBar(PERIOD_M15))
   {
   ibHandle =  iCustom(symb, PERIOD_M5, "ibbfill2", BBPeriod, BBDeviation, BBPrice);

   CopyBuffer(ibHandle, 9, 0, 3, ibValue);
   
   CopyBuffer(ibHandle, 8, 0, 3, ibbLower);
   CopyBuffer(ibHandle, 7, 0, 3, ibbUpper);
   CopyBuffer(ibHandle, 6, 0, 3, ibbMain);
   
   iBandsLower1  = ibbLower[1];
   iBandsUpper1  = ibbUpper[1];
   iBandsMain1   = ibbMain[1];
   
   upTrend2[symbolIndex] = ibValue[1]==1   ?  true  :  false;
   downTrend2[symbolIndex] = ibValue[1]==-1  ?  true  :  false;
   flatTrend2[symbolIndex] = ibValue[1]==0   ?  true  :  false;
   }
   downTrend = downTrend2[symbolIndex];
   flatTrend = flatTrend2[symbolIndex];
   upTrend = upTrend2[symbolIndex];
}


bool BBBuy(string symb)
{
    bool state;
    prices(symb);

    if (upTrend && !flatTrend && !downTrend)
    {
        state = true;
    }
    else state = false;

    return state;
}


bool BBSell(string symb)
{
    bool state;
    prices(symb);
    
    if (downTrend && !flatTrend && !upTrend)
    {
        state = true;
    }
    else state = false;

    return state;
}

bool BBFlat(string symb)
{
    bool state;
    prices(symb);
    
    if (!downTrend && flatTrend && !upTrend)
    {
        state = true;
    }
    else state = false;

    return state;
}

bool newBar(ENUM_TIMEFRAMES time)
{
   datetime          currentTime =  iTime(Symbol(), time, 0);
   static datetime   priorTime   =  currentTime;
   bool              results     =  (currentTime!=priorTime);
   priorTime                     =  currentTime;
   
   return results;
}