Is AUTHOR wrong in the post ? POST : Tldr at the bottom. First off a bit of context (also on mobile so I apologize in advance for formatting): 
I'm in 10th grade and recently had to do a group project in one of my classes. Now in the past, I had a friend (I'll call him Carl) who used to be my best friend (since 2nd grade). I'd say we had a little too many altercations over time to be considered best friends anymore but we still talk a little. 

So first period, my teacher says we have to do a group project (we had to make an infographic type thing on a subject). Carl asks if I want to work with him, I say sure. First day, we do research, find all the definitions and stuff and we're done. The next day, I start on the final product while Carl sits there on his phone for the entire hour and a half. I tell him he needs to work on his portion at home since he didn't do it in class, he agrees. Day before its due, we have a midterm so we don't work on it in class. I tell him to do it since we only have one day left. Later that night, I call him (seeing that he hasn't done it yet) and tell him to do it or I'm taking his name off the project. 

Now normally, I'd be fine with finishing the project on my own and putting his name on it, but there was a LOT if information to cover. He says ok, but still doesn't do it. 

At this point, I'm taking to my other friend who I'll call George. I mention the project to George and he says he completely forgot about it (keep in mind it's due the next day). I offer to put his name on the project and remove Carl's name (since I already warned Carl) in return for him helping me finish. He agrees, we finish the project (he did more work than Carl did throughout the whole week). 

Now the next day, today, comes along. The project is due at the end of the day, and I have not told Carl that I removed his name from the project. Selfish me wants to just let him get the zero as a wake up call to do his work but the other part of me wants to tell him so he can at least turn something in. 

So the question is, AITA for not telling Carl that I replaced him?

Tldr; Friend asks me to do a project, makes me do all the work, told him I would remove his name if he didn't do his part, replaced him with other friend who helped me finish. AITA?