/// <summary>
/// this function should be overidden by the child classes
/// </summary>
/// <param name="pm"></param>
virtual public void OnOverlap(PlayerMovement pm)
{
}
/// <summary>
/// this function should be overidden by the child classes
/// </summary>
/// <param name="pm"></param>
virtual public void OnOverlap(PlayerMovement pm)
{
}