$callFunction
To call a user-defined function created with $function
Usage:
$callFunction[Function Name;Argument 1 (optional);Argument 2....(optional)]
Example:
$callFunction[printHello;Mika]
Call the function, using $callFunction
Call the function, using $printHello
DANGER
A function name can't start with number, and must be within [A-Z or a-z or _ or 0-9]