csv parser, C++ (gcc)

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/*Parse	an escaped string into csvformat
Input: csvformat
    John,Smith,john.smith@gmail.com,Los Angeles,1
    Jane,Roberts,janer@msn.com,"San Francisco, CA",0
    "Alexandra ""Alex""",Menendez,alex.menendez@gmail.com,Miami,1 """Alexandra Alex"""
Output: escaped string
    John|Smith|john.smith@gmail.com|Los Angeles|1
    Jane|Roberts|janer@msn.com|San Francisco, CA|0
    Alexandra "Alex"|Menendez|alex.menendez@gmail.com|Miami|1 "Alexandra Alex"
*/
#include <iostream> 
#include <string>
#include <vector> 
using namespace std;

string parseCSV(string s){
    string res  = ""; 
    int n = s.length(); 
    bool inside = false; 
    for(int i=0; i<n; i++){
        char c = s[i];
        if(inside) {
            if(c == '\"') {
               if(i+1< n && s[i+1] =='\"'){ // multiple quote
                    res += '\"'; 
                    i++; // 2->1, 4->2
               }
               else
                    inside = false;
            }
            else
                res += s[i];   
        }
        else{
            if(c == ',') {
                res += '|';
            }
            else if( c == '\"') {
                inside = true;
            }
            else{
                 res += c; 
            }
        }
    }
    return res; 
}

int main(){
    // test1
    string s = "Jane,Roberts,janer@msn.com,\"San Francisco, CA\",0"; 
    cout << s << endl; 
    cout << "-> " << parseCSV(s) << endl;

//test 2
    s = "\"Alexandra \"\"\"\"Alex\"\"\"\"\",Menendez,alex.menendez@gmail.com,Miami,1 \"\"\"Alexandra Alex\"\"\"";
    cout << s << endl; 
    cout << "-> " << parseCSV(s) << endl;
    return 0;
}

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Compilation time: 0.42 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,5 sec