Trim a string

#include <iostream>
#include <string>

int main() {
    std::string str("/comando ");
    std::cout << str << "-" << std::endl;
    size_t endpos = str.find_last_not_of(" ");
    if( std::string::npos != endpos ) {
        str = str.substr( 0, endpos+1 );
    }
    std::cout << str << "-" << std::endl;
    return 0;
}