Changing URLs for blog cateogories

I have multiple blog categories and I want to change my URL's to remove the blog/category/ part.

So instead of mylocalcreatives.com.au/blog/category/blog I want mylocalcreatives.com.au/blog and instead of mylocalcreatives.com.au/blog/category/charity I want mylocalcreatives.com.au/charity.

Thanks,
Nat.