Iphone 4 camera stopped working?

So i dropped my phone pretty badly and my screen cracked. I don't know what happened, but after dropping it my back camera stopped working. Every time I try opening the camera app it stays on a closed shutter. The camera button and the button to switch from photo to video start to twitch. I just want to know a way to fix it, so my back camera can start working again. Thank you!

Added (1). Also my phone begins heating up on the camera every time I charge it or try to start the camera up. Another thing is i've tried downloading a separate camera app and it doesn't open on that either.

Bring it in to the apple store

Yep i believe that you would better take it to Apple store since it is really hard to deal with them without picture

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