C++ :: Comparing Two Strings With Strcmp

I have trouble comparing two strings with strcmp. The bold part of the code are the parts that are not working and i hope somebody can explain to me what i did wrong. Goal of the code is to compare a city name with the name of already created cities and when two of them match to creat a Street between them. Depending on the street pointer different streets can be created

my vector containing all already created cities (it seem to work)
std::vector<city*> citylist;//all cities

find city using strings and creating a road between them:

bool Map::add_street(Street *street, const string firsttown , const string secondtown) {
city* hilfs1=Map::find_city(erste);
city* hilfs2=Map::find_city( zweite);
if (hilfs1==NULL || hilfs2==NULL)
{return false ;} // Problem :both pointers are always NULL

[Code] ....

Here is also my implementation of the getname function :

std::string city::getname() {
return this->name;
}