palyer forward , side ways in running game

im developing running game so that it never stops until it get hit.i use player.forward so here is my problem when i want to change direction of player to 90(left) and -90(right) degree , player turns 90 degrees but also goes forward . can anyone seperate the forward and turning situation. And this is my code using UnityEngine; using System.Collections; using UnityEngine.EventSystems;

public class touchplayer : MonoBehaviour {

 private float fingerStartTime  = 0.0f;
 private Vector2 fingerStartPos = Vector2.zero;

 private bool isSwipe = false;
 private float minSwipeDist  = 50.0f;
 private float maxSwipeTime = 0.5f;


 private Vector2 startPos;
 private Animator animator;
 int TapCount;
 public float MaxDubbleTapTime;
 float NewTime;
 public CharacterController controller;
 void Start(){
     controller = GetComponent<CharacterController> ();
     animator = GetComponent<Animator> ();


 }
 void Update()
 {
     if (Input.touchCount > 0){

         foreach (Touch touch in Input.touches)
         {
             switch (touch.phase)
             {
             case TouchPhase.Began :
                 /* this is a new touch */
                 isSwipe = true;
                 fingerStartTime = Time.time;
                 fingerStartPos = touch.position;
                 break;

             case TouchPhase.Canceled :
                 /* The touch is being canceled */
                 isSwipe = false;
                 break;

             case TouchPhase.Ended :

                 float gestureTime = Time.time - fingerStartTime;
                 float gestureDist = (touch.position - fingerStartPos).magnitude;

                 if (isSwipe && gestureTime < maxSwipeTime && gestureDist > minSwipeDist){
                     Vector2 direction = touch.position - fingerStartPos;
                     Vector2 swipeType = Vector2.zero;

                     if (Mathf.Abs(direction.x) > Mathf.Abs(direction.y)){
                         // the swipe is horizontal:
                         swipeType = Vector2.right * Mathf.Sign(direction.x);
                     }else{
                         // the swipe is vertical:
                         swipeType = Vector2.up * Mathf.Sign(direction.y);
                     }

                     if(swipeType.x != 0.0f){
                         if (swipeType.x > 0.0f) {
                             // MOVE RIGHT
                         
                                 controller.transform.Rotate (0, 90, 0);
                                 
                             
                         } else {
                             // MOVE LEFT
                         
                                 controller.transform.Rotate (0, -90, 0);
                                 
                             
                         }
                     }

                     if(swipeType.y != 0.0f ){
                         if(swipeType.y > 0.0f){
                             // MOVE UP
                             animator.SetBool ("jumping", true);

                             Invoke ("stopJumping", 0.1f);
                         }else{
                             // MOVE DOWN
                             controller.height = 0.0f;
                             animator.SetBool ("sliding", true);
                             Invoke ("stopSliding", 0.1f);
                         }
                     }

                 }

                 break;
             }
         }
     }


         

         

         

                 
                     
                 

                 
             

         
                 
             
                  
                 /*animator.SetBool ("flying", true);
                 Invoke ("stopFlying", 8.0f);
                 print ("Dubble tap");*/


             
 }

     

void stopJumping(){

     animator.SetBool ("jumping", false);
 }
 void stopSliding(){

     animator.SetBool ("sliding", false);
 }
 void stopFlying(){

     animator.SetBool ("flying", false);
 }

}