Write a C++ program to check if the first appearance of "a" in a given string is immediately followed by another "a"

#include <iostream>
using namespace std;


bool test(string str)
        {
            int counter = 0;
            for (int i = 0; i < str.length()-1; i++)
            {
                if (str[i] == 'a') counter++;
                if(str.substr(i, 2) == "aa" && counter < 2) 
                return true;
            }
            return false;
        }
        
int main() 
 {
  cout << test("caabb") << endl;  
  cout << test("babaaba") << endl;  
  cout << test("aaaaa") << endl;  
  return 0;    
}