how to create a rotate function

Question

hello boys and girls. I am stranded in a javascript code. the code consists of clicking on a div element and it must rotate 90 degrees for each click until reaching 360 degrees. I still can't figure out how to make a function that can execute this.
https://code.sololearn.com/Wa7YzRmujZ4w/?ref=app

Answer 1

https://code.sololearn.com/WVIkHD0N3eqQ/#html