error: request for member 'empty' in 's', which is of non-class type 'const char' 65 | if (s.empty() || s[s.size() - 1] == '.')

I am reading a C++ Book C++ Primer 5th Edition in chapter 4 there is a code block

for (const auto &s : text)
{
    cout << s << " " << typeid(s).name() << " ";
    if (s.empty() || s[s.size() - 1] == '.')
        cout << endl;
    else
        cout << " "; // otherwise just separate with a space
}

When i run this code and using text string it is give me an error and the same when i use char*

`op.cpp:65:9: error: request for member 'empty' in 's', which is of non-class type 'const   char'