Closing orders

Hi! I would like to know if it is really necessary to use the return(0) function in the code below, thanks in advance for any help!

{
int total=OrdersTotal();

for (int cnt=total-1;cnt>=0;cnt--)
{
if(OrderMagicNumber()==Magic&&OrderSymbol()==Symbo l())
{
{
OrderClose(OrderTicket(),OrderLots(),Bid,3);
}
}
}
return(0);
}

{
int total=OrdersTotal();

for (int cnt=total-1;cnt>=0;cnt--)
{
if(OrderMagicNumber()==Magic&&OrderSymbol()==Symbo l())
{
{
OrderClose(OrderTicket(),OrderLots(),Bid,3);
}
}
}
return(0);
}

{
int total=OrdersTotal();

for (int cnt=total-1;cnt>=0;cnt--)
{
if(OrderMagicNumber()==Magic&&OrderSymbol()==Symbo l())
{
{
OrderClose(OrderTicket(),OrderLots(),Bid,3);
}
}
}
return(0);
}

//Close Sell Orders
int CloseSellOrders(int Magic)
{
int total=OrdersTotal();

for(int cnt=total-1;cnt>=0;cnt--)
{
if(OrderMagicNumber()==Magic&&OrderSymbol()==Symbo l())
{
if(OrderType()==OP_SELL)
{
}
}
}
return(0);
}

int CloseSellOrdersHiddenTP(int Magic)
{
int total=OrdersTotal();

for(int cnt=total-1;cnt>=0;cnt--)
{
if(OrderMagicNumber()==Magic&&OrderSymbol()==Symbo l())
{
{
}
}
}
return(0);
}

int CloseSellOrdersHiddenSL(int Magic)
{
int total=OrdersTotal();

for(int cnt=total-1;cnt>=0;cnt--)
{