A challenge for ya coders

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Had a bet with my teacher, he challenged me to make a c program (basic one), and add an auth system, he will try to crack it infront of the class

This could be a cool project wich I thought some of you can help me
I'll do a giveaway after ofc

My teacher is pro af,
Any help would me great
Emotion#6876

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[font]What is the deadline of this project?[/font]

Month