Category element

Hello,

Is there a way to have Category name as only element in the permalink just like %postname% for post urls. Currently, I am using %postname% as custom structure in the permalinks.

I want to create a custom structure for any category (parent category, sub-category, sub-sub-category…) as follows,

http://example.com/category-name
http://example.com/sub-category-name

Could anybody please help me in this matter. Thanks in advance.

Regards,
Dayakar