KoD

string urlDecode(string text)
    {
      string escaped;

      for (auto i = text.begin(), nd = text.end(); i < nd; ++i)
      {
        auto c = ( *i );

        switch(c)
        {
          case '%':
            if (i[1] && i[2]) {
                char hs[]{ i[1], i[2] };
                escaped += static_cast<char>(strtol(hs, nullptr, 16));
                i += 2;
            }
            break;
          case '+':
            escaped += ' ';
            break;
          default:
            escaped += c;
        }
      }

      return escaped;
    }