Problem with mooving sprites

Hello!

     public class block
     {
         public Texture2D textura;
         public Vector2 position;
 
         public void addBlock(Texture2D iTexture, Vector2 iPosition)
         {
             textura = iTexture;
             position = iPosition;
             
             Sprite block = new Sprite ();
             block = Sprite.Create (textura, new Rect (0, 0, 100, 100), position);
             new GameObject().AddComponent<SpriteRenderer> ().sprite = block;
     
         }
 
         public void Update()
         {
             position += new Vector2 (0.1f, 0);
         }
 
     }
 
 (...)
 
 List<block> blocks = new List<block>();
 
 (...)
 
                 block block = new block();
                 block.addBlock(texture, new Vector2(x, y);
                 blocks.Add(block);
 
 (...)
 
 I write class, and
         if(blocks[0] != null)
             blocks [0].Update ();
 
 Unfortunately, the sprite is not moving. Why?
 I very sorry for my English, but I don't know this language well.