It took me a few hours.
Write a rotation matrix.
But it has a few hundred lines of code.

I want to get him out of it.
From the main program of the Allegro.

I exploded my head:-X

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Pointer? Or something else?

It sounds like you want to move a large piece of code from main() to a function.
But you didn't say what is your problem.

And without posting code.