SDL2, how predict rect coordinates after rotation?

Question

My goal - move sprite, left and right arrows keys must set directions of moving.I struggle with rotation geometry few days, and it beat me. My code below

void rotate_point(float cx, float cy, float angle, int *px,int *py) {
    *px = cos(angle) * (*px - cx) - sin(angle) * (*py - cy) + cx;
    *py = sin(angle) * (*px - cx) + cos(angle) * (*py - cy) + cy;
}

https://pastebin.com/vUvnNkKb

How you can see, moves of red line on rotations mismatched with X,Y of sprite rect.Many thanks to everyone who can helps.