funktion med pointer osv

Hej

Hvad skal jeg gøre for at få dette til at virke?

#include <iostream>
#include <string>

int main()
{

        std::string hent(std::string *s)
        {
                std::string temp;

                // find første \n
                int f = *s.find_first_of("\n");

                // temp
                temp = *s.substr(0, f);

                // resten
                *s = *s.substr(f+1, *s.size() - f -1);

                //return
                return temp;
        }

        // strings
        std::string ind;

        // tekst
        ind = "hejsa\nmereher\njaja\n";

        // udskriv
        std::cout << "ind er: '" << ind << "'\n";
        std::cout << hent(&ind) << "\n";
        std::cout << "ind er nu: '" << ind << "'" <<std::endl;

        return 0;
}
"string.cc" 36 lines, 567 characters
> g++ string.cc -o ok
string.cc: In function `int main()':
string.cc:8: syntax error before `{'
string.cc:12: `s' undeclared (first use this function)
string.cc:12: (Each undeclared identifier is reported only once
string.cc:12: for each function it appears in.)
string.cc:15: `temp' undeclared (first use this function)
string.cc: At top level:
string.cc:28: ANSI C++ forbids declaration `ind' with no type
string.cc:28: conflicting types for `int ind'
string.cc:25: previous declaration as `class string ind'
string.cc:28: initialization to `int' from `const char *' lacks a cast
string.cc:28: confused by earlier errors, bailing out
>