need help with error type mismatch on llSay

Hi can some one help me with this script I am getting error type mismatch on llSay(0,where + " " + (string)rot + " " + (string)who); and I can’t see why please help

murdock

////////////////////////////////////////////////////////////////////////////////////////////////////////

string who;
vector where;
rotation rot;

default
{
link_message(integer sender_number, integer number, string message, key id)
{
where = llGetPos();
rot = llGetRot();
who = message;
llSetTimerEvent(.5);
}
timer()
{
llSetTimerEvent(0);
llSay(0,where + " " + (string)rot + " " + (string)who);
}
}

////////////////////////////////////////////////////////////////////////////////////////////////////////

You're typecasting one variable which doesn't need to be (since it's already a string), and not typecasting another which does.

Thank you.