Please create a law that restricts bills from having anything other than the subject of the bill added to it.

Every day there is legislation passed with a purpose to do something, and at the bottom of that bill there is something added to it that has nothing to do with the original bill's subject. I feel like this is getting way too common for unpopular items to be passed just because they are attached to necessary bills that HAVE to be passed. Examples include having "repeal Obamacare" attached to the budget. The budget and Obamacare are not directly associated with each other (maybe pulling funds from Obamacare) but that is not the point. The point is that bills go in wanting to do one thing, and come out with five things attached to that one thing. It should not be allowed, and should not be legal.