#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <windows.h>
#include <assert.h>

std::string UrlDecode(std::string &SRC)
{
    std::string ret;
    char ch;
    int ii;
    for (size_t i=0; i<SRC.length(); i++) {
        if (int(SRC[i])==37) {
            sscanf(SRC.substr(i+1,2).c_str(), "%x", &ii);
            ch=static_cast<char>(ii);
            ret+=ch;
            i=i+2;
        } else {
            ret+=SRC[i];
        }
    }
    return (ret);
}


int main(int argc, char *argv[])
{
    printf("Hello, world\n");
    std::string file_path = "C:\\Program%20File\\";
    
    std::string str = UrlDecode(file_path);
    assert(!strcmp(str.c_str(),"C:\\Program File\\"));
    
    return 0;
}