adding extra add to cart button

hello devs i am trying to add an extra add to cart button below product summary i used this code https://gist.github.com/imzautomation/a256deeace3b2ffbddc2484d20230ba7 which works for single product but if the product is a variation it doesnot work please suggest as what to do?