Animataion of a Sprite v2

Hey Unity Community, I am trying to animate this sprite, in this scene. I have asked this question before, and some cool people helped me to get started.

For some reason nothing is happening when I play the game.

This is the sprite sheet:

To make the sprite move, it has to increase the OffsetX from (0,0.33,0.66) and decrease the offsetY from (0.66,0.33,0). When the coordinates get to X = 0.66, and the Y is at zero, there is nothing there, so I just reset the coordinates back at the first sprite.

Here is the code:

 using UnityEngine;
 using System.Collections;
 
 public class SpriteSheet_Asuka : MonoBehaviour
 {
     // Use this for initialization
     //OffsetX and offsetY to set where it the sprite starts.
     public float offsetX = 0f;
     public float offsetY = 0.66f;
     public float tilingX = 0.3f;
     public float tilintY = 0.3f;
 
 
     void Start()
     {
 
         animate();
 
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
         renderer.material.mainTextureOffset = new Vector2(offsetX, offsetY);
         renderer.material.mainTextureScale = new Vector2(tilingX, tilintY);
 
     }
 
     IEnumerable animate()
     {
        int currentFrames = 0;
         int totalFrames = 7;
         while (totalFrames > currentFrames)
         {
             renderer.material.mainTextureOffset = new Vector2(offsetX, offsetY);
 
             if (offsetX > 0.66f)
             {
                 offsetX = 0f;
                 offsetY -= 0.33f;
             }
             else if (offsetY == 0f && offsetX == 0.66f)
             {
                 offsetX = 0f;
                 offsetY = 0.66f;
             }
             else
             {
                 offsetX += 0.33f;
                 currentFrames++;
             }
 
 
             if (currentFrames == 7)
             {
                 currentFrames = 0;
             }
 
         }
         yield return new WaitForSeconds(1);
 
     }
 
 
 }