c++: Compiling Error

#include <iostream>
#include <string>

using namespace std;

void reverseString(string& string);

int main (int argc, char * const argv[])
{
    string s;
    cout << "Enter a string: ";
    getline(cin, s);
    
    reverseString(s);
    cout << "Reversed string = " << s;
    
    return 0;
}

void reverseString(string& string)
{
     int strLength;
     string rvrString; // Line where I'm getting the error
     
     strLength = string.length();
     
     for (int j = 0, i = strLength - 1; i <= 0; i--, i++)
     {
     } 
}