is there an easy fix for worn down brakes? I have a really cheap Walmart bike with originally came with questionable brakes. After more than a year of commuting, they have worn down to next to nothing. Is there any easy fix at home to improve brake performance?

UPDATE: Brought it to a bike shop and they said its a mixture of cable stretch and worn brake pads.  Getting front and back brake alignment for $14
The easy fix is getting new brake pads.  The hard fix will be when they are worn down to metal and start to dig into the aluminum brake track of the wheel. At which point you will be better off getting a new bike rather than paying to replace wheels and brakes on a BSO.