Can anyone tell me why my character doesn't rotate

Can anyone tell me why my character won't rotate?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class NewBehaviourScript : MonoBehaviour {
5.  
6.     public float movemetspeed = 5.0f;
7.     public float mousesensitivity = 5.0f;
8.     public float updwnrange = 80.0f;
9.  
10.     // Use this for initialization
11.     void Start () {
12.    
13.     }
14.    
15.     // Update is called once per frame
16.     void Update () {
17.         //rotation
18.  
19.         float rotX = Input.GetAxis ("Mouse X");
20.  
21.         transform.Rotate (0, rotX, 0);
22.  
23.         float rotupdwn = Input.GetAxis ("Mouse Y") * mousesensitivity;
24.  
25.         float currentupdwn = Camera.main.transform.rotation.eulerAngles.x;
26.         float desiredupdwn = currentupdwn - rotupdwn;
27.  
28.         Camera.main.transform.rotation = Quaternion.Euler (desiredupdwn, 0, 0);
29.  
30.         //movement
31.         float forwardspeed = Input.GetAxis ("Vertical") * movemetspeed;
32.         float sidespeed = Input.GetAxis ("Horizontal") * movemetspeed;
33.  
34.         Vector3 speed = new Vector3 (sidespeed, 0, forwardspeed);
35.  
36.         speed = transform.rotation * speed;
37.  
38.         CharacterController cc = GetComponent<CharacterController>();
39.  
40.         cc.SimpleMove (speed);
41.     }
42. }//
43.