> I don't even know what a "love-letter to C" is
Oh come on, you've never done something just for the passion of it? Not trying to earn money or get famous, you just do something because you personally enjoy it with no other motivation than that.
Even if you haven't, a lot of people do stuff purely for their own personal satisfaction. That's what a "love letter to x" is. You just do it for the love.
We are going into a weekend, I challenge you to do something just for the love of it.