[Trinity] How do i get a mob to say a player name?

[controlsx2]

So i have the player. Im using plr->GetName() to get the name and trying to append " Great job killing the Devilish Ghoul" to the end and have a mob say it.
The MonsterSay function wants a Char* for the text.

Would the following work?

 std::string chatmsg;
                           chatmsg = (std::string)plr->GetName() +  " Great job killing the Devilish Ghoul";
                           me->MonsterSay(chatmsg.c_str(),LANG_UNIVERSAL,NULL);

the IDE isnt showing any errors but i dont know if using the + operator is right