Short no effort
Very little effort has been made creating the tutorial. I have an iPhone XS Max and the code is still cramped without any breaks or indentions.
Not enough ratings yet to assess Tutorial for C.
Tutorial for C appears to be a legitimate app. AppsHunter Legitimacy Score for Tutorial for C is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.