I think I overfilled the gas on my lawnmower and now it is puffing black smoke. what do I do?

I've never filled the gasoline on a lawnmower before. When I tried to do it today I accidentally spilled some all over the mower because I dont have a funell.
I tried to wipe up the excess with a paper towel but I think some of it got into the engine.
When I turn it on it makes huge puffs of smelly black smoke and then dies after a few seconds.
What should I do to get my mower working again?
Okay. So I waited 20 minutes. Now when I start the engine, it puffs white smoke, not black smoke. But it still dies after 10 seconds or so.
What should I do to fix this problem??
Alright...I'm an idiot.
It looks like I filled the oil tank with gasoline instead of the gasoline tank.
Yeah, I know. Real stupid.
I didn't realize there was a difference.
So now I obviously know what caused this problem.

What I dont know is what to do about it!

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