How to add a button when clicked only once?

Question

JavaScript

Hey guys. Tried different ways to do it does not work. I need something when I click on the button to create 2 buttons (Remove, Start), but only once, and not like mine 2.
Please tell me how to arrange this?
Code - https://codepen.io/Slasher_/pen/rJygPZ?editors=1010
Thank you!

Answer 1

Just add a check to see if you've already created these buttons or not.

if (кнопок_еще_нет) {
  добавить
}