With this function you can clear all data from the given stack
data-structure. This does NOT destroy the data-structure
(for that you should use ds_stack_destroy) it only
wipes all data from it and returns an empty stack.
if ai_count = 15 && !ds_stack_empty(AI_stack)
alarm = room_speed;
ai_count = 0;
The above code checks a variable to see if it has reached a specific value and if it has it clears the ds_stack indexed in the variable "AI_stack", sets an alarm, and resets the variable to 0.