Canvas is not cleaned properly

Question

when drawing a circle it does not clear help
https://code.sololearn.com/W3T0uR0z91pu/?ref=app

Answer 1

function animate() {
requestAnimationFrame(animate);
c.clearRect(0, 0,innerWidth, innerHeight);

for (var i = 0; i < circleArray.length; i++)
circleArray[i].update();
}

do something like this.
clearRect clears the screen.

And call this animate() inside onload.

Answer 2

problem still exists