Change my Expert code(Simple)

Hello

I have a simple code:

void OnTick()
  {
//---

double current_bid = SymbolInfoDouble(_Symbol, SYMBOL_BID);
double current_ask = SymbolInfoDouble(_Symbol, SYMBOL_ASK); 
Print("First");
Print(current_ask);
Sleep(10000);
double current_ask_new = SymbolInfoDouble(_Symbol, SYMBOL_ASK);
Print("Second");
Print(current_ask_new);
Print("Difference");
Print(int(current_ask_new-current_ask)*Point);
}

It print the current price and then wait 10 sec's and print the price after 10 sec's

The problem is: It works on live Meta correctly, But I know that sleep() function doesn't works on strategy tester, I want to modify the above code that works on strategy tester