I want a complete contact form, with. html included

form :: String -> String -> String -> String -> String
form firstname lastname email phone = "<form>
  <input type=\"text\" name=\"firstname\" value=" ++ firstname ++ " />
  <input type=\"text\" name=\"lastname\" value=" ++ lastname ++ " />
  <input type=\"text\" name=\"email\" value=" ++ email ++ " />
  <input type=\"text\" name=\"phone\" value=" ++ phone ++ " />
</form>"