My keys on my macbook are kinda like sticking down and make a ugly noise please help me

Hello , my keys on my macbook pro 2011 13" i7 500 gb are stucking and making a weird noise  I dont know what to do ,
1. How to fix it
or 2. Send it back and tell the ( macmall ) seller to reclaim it or something please help meee .

Your code is absolutely unreadable - even if someone was willing to
help, it's simply impossible. I do give you a few tips, though: If you
understand your code (i.e. if it really is YOUR code), you should be
able to realize that your minimum and maximum never get set (thus they
are both 0) and your exam 3 is set with the wrong value. SEE where
those should get set and figure out why they're not. Chances are you
are doing something to them that makes one 'if' fail or you just
erroneously assign a wrong variable!

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