Add "Domain.com" to the end of a URL

I have a issue where users could potenially type in http://hostname which gets redirected(I created the rule already) to https://hostname.  

The problem is that we have a wildcard cert for *.domain.com so when users go to the URL without .domain.com there is a cert warning.  How can I create a Rule that will seehttp://hostname and rewrite to https://hostname.domain.com?