What should do to avoid smelly feet?

Wash your feet thoroughly and carefully dry them at least once every day. Use powder on your feet to help absorb sweat. Wear moisture-absorbant socks. There are commercially available products you can use in the shoes to reduce odor that results from the close confinement of your feet in the shoes. If you don't have to wear closed shoes, wear open shoes or sandals.

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Answer:
Dr Scholls inserts for your shoes.

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Answer:
put baby powder in your shoes

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Answer:
If you've gotten a pair of shoes smelly from either sweating in them or especially wearing them without socks, you will need to wash them and deodorize them or else they'll just keep making your feet stink.

I would also buy a pumice stone to scrub you feet with to get the dead skin off which will help keep bacteria from building up so easily.