задача на Строки - C++

#include <iostream>
#include <algorithm>
#include <string>
 
int main ()
{
   std::string s (" He llo world ");
   size_t found;
   
   while ( (found  = s.find (' ')) != std::string::npos )
      s.erase (s.begin () + found);
   std::cout << s << std::endl;
   return 0;
}