Player Don´t Jump

I followed The 2d Tutorial her in Unity...but my Player still can´t jump...here is the code

 using UnityEngine;
 using System.Collections;
 
 public class MrCorkCharacterController : MonoBehaviour
 {
     public float maxSpeed = 10f;
     bool facingRight = true;
 
     Animator anim;
 
     bool grounded = false;
     public Transform groundCheck;
     float groundRadius = 0.2f;
     public LayerMask whatIsGround;
     public float jumpForce = 700f;
 
 
     bool doubleJump = false;
 
     void Start () 
     {
     
         anim = GetComponent<Animator>();
     }
     
 
     void FixedUpdate () 
     {
         grounded = Physics2D.OverlapCircle(groundCheck.position, groundRadius, whatIsGround);
         anim.SetBool("Ground", grounded);
 
         if (grounded)
                         doubleJump = false;
 
         anim.SetFloat ("vSpeed", rigidbody2D.velocity.y);
 
         if (!grounded)
                         return;
 
 
         float move = Input.GetAxis ("Horizontal");
 
         anim.SetFloat ("Speed", Mathf.Abs(move));
 
         rigidbody2D.velocity = new Vector2(move * maxSpeed, rigidbody2D.velocity.y);
 
         if (move > 0 &&!facingRight)
                         Flip ();
                 else if (move < 0 && facingRight)
                         Flip ();
     }
 
     void update()
     {
         if((grounded || !doubleJump) && Input.GetKeyDown(KeyCode.Space))
         {
             anim.SetBool("Ground", false);
             rigidbody2D.AddForce(new Vector2(0, jumpForce));
 
             if (!doubleJump && !grounded)
                 doubleJump = true;
         }
 
 
     }
 
 
 
 
     void Flip()
     {
         facingRight = !facingRight;
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;
         }
 
 }