We have a printf function in uucore, which is used by several utils. Most notably, it's basically the entire implementation of the printf utils. This makes sense, but it's not correct, because the printf function should not handle escape sequences, but the printf util should.

So, we should split the two. Probably, this means that the util is best written entirely separate from the function. But another option is to share some functionality still.

I'm already working on this, so I'm assigning myself :)