Is there an iPhone app to go to the home screen? My Home button isn't working well?

IIm afraid my home button will completely stop working soon enough, and i don't currently have money to replace it. I really only need the home function, but it would be really nice if it also had a screenshot function (because screenshots need the home + lock combo)

Added (1). Edit: If it makes any difference, my phone is an iPhone 3GS (old, lol) and has iOS 6.1.6.

Go into your settings look for general > accessibility > assistive touch. Hope this helps

Go to settings>general>accesibilty>assistive touch. And turn it on

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