Open the application and test its functionality

the only functionality it to enter a code to check if it’s correct or not

Now let’s enter random data

Notice the Box with

This Code Is Invalid!!!

not what we expected but we got a string to search with!

Why is this important?

Now let’s search for the string we found

Now let’s see

Notice we found the secret code.

Going to the logic

Notice that when this function is called the code we enter and the correct code are pushed onto the stack