timer

public static Coroutine StartTimer01(this MonoBehaviour mb, float exitTime, Action onFinished, Action<float> onUpdate)
    {
        return mb.StartCoroutine(Timer01(exitTime, onFinished, onUpdate));
    }
    
    public static IEnumerator Timer01(float exitTime, Action onFinished, Action<float> onUpdate)
    {
        float journey = 0f;
        while (journey <= exitTime)
        {
            journey = journey + Time.deltaTime;
            float percent = Mathf.Clamp01(journey / exitTime);
            onUpdate.Invoke(percent);
            yield return null;
        }
        onFinished.Invoke();
    }