In order to get started in the repository you need to follow the instructions in the documentation, there you will have everything you need to follow the whole process.
Okay, I will check this issue; however, inside of those repos; where can find the " Programming and ctf-hacking challenges" files, I only see a bunch of folders that contains some codes. Is that right?
BTW, I am going to solve the challenges with Java. I hope your answer for this question,