Hyperlink Domain Appending

I am trying to make hyperlinks out of multiple cells or even hardcoding the domain name and appending the cell content to it.

Example:
=hyperlink("[http://www.domain.com]+A1+B1",C1)
=hyperlink("A1+B1+C1",D1)

I don't know if this is possible, but I am not that familiar with all of the formatting options available as I don't use Excel that often.

Any ideas on how I can make this work?