Learn what to do in such situations

1) Many people get sweaty feet even in winter.  So take care of your feet first.  Every night come home and soak your feet in warm water with salt.  Then wipe well and apply moisturizer.

 2) Wash socks daily.  Use Dettol water if you can, or buy multiple socks and change them occasionally.  You will see that the problem will be solved.

 3) Don't forget to spray perfume on socks.  This can make the problem worse.
 4) Wash feet well before wearing socks.  Take some baking soda and rub it on your feet.  You will see that the problem will go away.

 5) Back home put some paper inside the shoes.  It will remove the bad smell in the shoes.

 6) Put the shoes in the sun once a week.  It will also keep the shoes clean and smell free.  If necessary, you can put naphtholine in the shoes.