Beginner in C trying to reverse engineer my simple program

Hi. Just started learning C a couple days ago after watching some tutorials on youtube. I created a simple program that asks the user for a key, and if the user inputs back the correct key, you get a "CORRECT" message, and of course, the wrong key gives the "INCORRECT" message. So, i want to somehow reverse engineer the program to allow any key or maybe even change the key. How would i do this? (Source code and binary file for linux: https://filebin.net/lqe1vdwgd7xaony0).

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from hacking: security in practice https://ift.tt/2Lbiwa8