2D collisions check between 3 and more objects - c++

Question

i've got a problem on my collision Check Algorithm.
The problem is when i try to resolve collisions between 3 objects, 1 of them is still not colliding and not resolving collisions, here's the code:
void check_collisions(engine_t* engine)
{
for (int i = 0; i < engine->actor_count; i++)
{
actor_t* first = (actor_t*)engine->collision_pairs->data[i];
collider_t* a = (collider_t*)get_component_by_name(first, "collider");
for(int j = 0; j < engine->actor_count; j++)
{
actor_t* second = (actor_t*)engine->collision_pairs->data[j];
if(second == first)
continue;
collider_t* b = (collider_t*)get_component_by_name(second, "collider");
hit_state_t hit = aabb(a, b);
resolve_collisions(a, b, hit.normal);
}
}
}
The problem is that when for example: i have A, B, C
A could collide with B and C at the same frame time, it seems that when more object are colliding the first one (first) will not be calculated anymore.. any idea?
void resolve_collisions(collider_t* a, collider_t* b, vec2_t normal)
{
//Stop rigidbody
vec2_t position = a->owner->transform.position;
vec2_t position2 = b->owner->transform.position;
rigid_body_t* rb = (rigid_body_t*)get_component_by_name(a->owner, "rigid_body");
// if(!rb) { SDL_Log("rigid_body not while resolving collisions"); return; }
//hit from dx
if (normal.x > 0.0f && position.x < b->owner->transform.position.x + b->size.x)
{
rb->velocity.x = 0.0f;
// SDL_Log("collided dx");
position.x = (b->owner->transform.position.x + b->size.x) + 0.7f;
}
//hit from sx
if (normal.x < 0.0f && position.x + a->size.x > b->owner->transform.position.x)
{
rb->velocity.x = 0.0f;
float offset = b->size.x - a->size.x;
float offset2 = a->size.x - b->size.x;
// SDL_Log("collided sx");
position.x = (b->owner->transform.position.x - b->size.x) + offset;
position2.x = (a->owner->transform.position.x - a->size.x) + offset2;
}
//hit from top
if (normal.y < 0.0f && position.y + a->size.y > b->owner->transform.position.y)
{
rb->velocity.y = 0.0f;
float offset = b->size.y - a->size.y;
position.y = (b->owner->transform.position.y - b->size.y) + offset;
}
//hit from bottom
if (normal.y > 0.0f && position.y < b->owner->transform.position.y + b->size.y)
{
rb->velocity.y = 0.0f;
// SDL_Log("collided bottom");
position.y = (b->owner->transform.position.y + b->size.y) + 0.7f;
}
//change pos
a->owner->transform.position = position;
}
any help would be much appreciated!
-Thanks