Global variable Buffer Overflow to leak memory - 34C3 CTF readme_revenge (pwn)

Two years ago I failed to solve the readme challenge at the 32c3ctf. Since then I have learned a lot and I got another chance!

readme 32c3ctf: https://www.youtube.com/watch?v=wLsckMfScOg
readme_revenge: https://archive.aachen.ccc.de/34c3ctf.ccc.ac/challenges/index.html
What is CTF? https://www.youtube.com/watch?v=8ev9ZX9J45A
Why you should play CTFs: https://www.youtube.com/watch?v=rfjV8XukxO8

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→ Graphics tablet:* https://geni.us/wacom-intuos
→ Camera#1 for streaming:* https://geni.us/sony-camera
→ Lens for streaming:* https://geni.us/sony-lense
→ Connect Camera#1 to PC:* https://geni.us/cam-link
→ Keyboard:* https://geni.us/mech-keyboard
→ Old Microphone:* https://geni.us/mic-at2020usb

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