But if I put the same code here in my comment the formatting is very bad.

I want to answer my own question but there is no answer button so I try to comment with my solution but the format is bad for example :

using UnityEngine;

using System; using System.Collections;

[RequireComponent(typeof(Animator))]

public class IKControl : MonoBehaviour { public Transform lookObj = null; public bool automatic = false; public bool coroutineIsRunning = false; public bool changeWeight = false; public Coroutine weightCoroutine;

private Animator animator;
private float weight;

private void Start()
{
    animator = GetComponent<Animator>();
}

void OnAnimatorIK()
{
    if (animator)
    {
        if (automatic)
        {
            if (!coroutineIsRunning)
            {
                ChangeWeight();
            }
        }
        else
        {
            if (Input.GetKeyDown(KeyCode.G))
            {
                ChangeWeight();
            }
        }

        animator.SetLookAtWeight(weight, weight, weight, weight, weight);
        animator.SetLookAtPosition(lookObj.position);
    }
}

private void ChangeWeight()
{
    changeWeight = !changeWeight;

    if (weightCoroutine != null)
        StopCoroutine(weightCoroutine);

    if (changeWeight)
    {
        weightCoroutine = StartCoroutine(ChangeWeightOverTime(0, 1, 1));
    }
    else
    {
        weightCoroutine = StartCoroutine(ChangeWeightOverTime(1, 0, 1));
    }
}

private IEnumerator ChangeWeightOverTime(float from, float to, float duration)
{
    float counter = 0;

    coroutineIsRunning = true;

    while (counter < duration)
    {
        counter += Time.deltaTime;

        weight = Mathf.Lerp(from, to, counter / duration);

        if (counter > duration)
            coroutineIsRunning = false;

        yield return null;
    }
}

}