You might want to change the indentation first.
function servercmdtest(%client)
{
messageclient(%client,'',"<color:ffffff>You have <var:cl:Test> Stone | And <var:cl:Test2> Iron");
return;
}
In order to make a forever-lasting bottomprint on someone, do %client.bottomPrint("\c3Your message");.
You should replace <color:FFFFFFF> with \c6, which means white. Do /colortest ingame to find out the rainbow.
Since you already have the client represented by a variable, and you aren't using sounds, an easier way to do it is:
%client.chatMessage("\c6Your message here");
That's just my opinion. I'm not sure about VCE variables, but if they're anything like regular ones you should be able to access them through %client.variableName.