Is there any cure for crack heel?

Yes: There are many treatments and all are aimed at keeping the foot hydrated. There are several over the counter creams that work well. In my experience the best cream is called idonia. Which ever cream you use, it is best to use it "under occlusion" which means that it is covered up. Plastic wrap is a great way to do this but socks work as well.

Treat the Cause: Hello, The "cure" for heel fissures would be to try to find out the cause/ source of what is causing the heel cracks. Often addressing the source of the dry skin can clear this up. Also the use of steroid creams to help reduce the inflammation in the area has been helpful in clearing this up.