how to close positions for the current symbol only

[halantrader]

my code:

void closePosition()

  {

   for(int i=0; i<PositionsTotal(); i++)

   {

      if(PositionGetString(POSITION_SYMBOL)==_Symbol)

     {

      Trade.PositionClose(PositionGetTicket(i));

     }

   }

  

  }