separate out the drawSmile() function



Move the code for smile from inside draw()
to a new function named drawSmile().
function drawSmile() {
  stroke(0);
  strokeWeight(8);
  noFill();
  arc(width/2, height/2, 300, 300, 0.25, PI - 0.25);
} //drawSmile
    
Replace the original pupils code in draw()
with a call to the new function:
    drawSmile();
    
The face should still appear as before.