Comminuted fracture is seen within right medial cuniform bone with sliglhty displaced cortical bony fragment laterally do u think cast will heel up?

Probably: Fortunately the cuneiforms are pretty rigid with alot of soft tissue/capsular attachment that help form the midfoot. A cast should help to allow things to heal and ossify. This may predispose you to some midfoot pain/arthritis as you get older. A good arch support may help longterm. I'd let your orthopod determine if cast or boot or postop shoe is appropriate w/o seeing films.

Cuneiform fracture: If the displacement is not too great - speaking without an xray here - then a cast/cast boot will allow healing to take place. There is a likelihood of arthritis in the future. Good luck !

Fracture : There is always a chance with any displaced bone that it won't heal but if its slight and your doctor placed you in a cast i would agree with that treatment.