remove file extension from a filename

gistfile1.cpp

std::string removeExtension(const std::string& fileName)
{
   std::string r = fileName;

   const size_t dotIndex = r.rfind(".");
   if (dotIndex == std::string::npos) {
      return fileName;
   }

   std::string::const_iterator it = r.begin() + dotIndex;
   
   if (r.end() == it) {
      return fileName;
   }

   r.erase(it, r.end());

   return r;
}