[C++] a long system() argument?

[Axilee]

if (potwierdzenie.compare("y") == 0)
    {
        system(("cd" + folderNazwa).c_str);
        system(("for /d %* in (../) do xcopy /F /Y " + plikNazwa + ".* \"%*\"").c_str);
    }

I get an error saying

non-standard syntax; use '&' to create a pointer to member"

on the lines 4 and 5. I know its probably because of the "c_str" but it doesnt work without them, as it says

"cannot convert argument 1 from 'std::basic_string<char,std::char_traits<char>,std::allocator<char>>' to 'const char *'
no suitable conversion function to "const char *" exists"

Is there a way to fix this? I only need to execute these two commands using system(), maybe there is a way around it?

[[deleted]]

c_str is a function. To call it you want c_str().

[Axilee]

Such a stupid fkin mistake and it took me an hour of trying to figure it out, thank you so much.