Controller / movement script rotate while moving HELP

Hello, Im very new to unity but having a blast learning, however ive run into a issue i cannot solve, or maybe ive just overworked myself searching. I have wsad for moving forward back left and right (there stuck to set directions tho and thats effecting my issue but is not the main problem) i have jump set to space (working good altho the camera is a tiny bit off sometimes) and i have my q and e keys set to rotate the camera.. all with the animations set and working. SO my main problem, I can't rotate WHILE moving in any direction and i can't move in the direction i've rotated too.. I want to rotate the camera and move forward in that direction. Here is my script

using System; using System.Collections; using System.Collections.Generic; using UnityEngine;

public class DemoCharacterController : MonoBehaviour {

 public static DemoCharacterController instance;
 private void Awake() {
     instance = this;
 }
 Animator anim;
 PlayerCharacter player;
 CharacterController cc;

 private float movementSpeed;

 public float walkSpeed = 1.5f;
 public float runSpeed = 4;
 public float rotationSpeed = 10;

 public float jumpForce = 25;
 private float currentJumpForce;

 public void PickupItem(int itemId) {
     player.EquipItem(itemId);
 }


 public float jumpTime=1.5f; // how long the whole jump takes
 private float jumpTimer; 

 public float jumpStartDelay = 0.35f;// delay jump to match the animation
 private float jumpStartDelayTimer;

 public Vector3 gravity = new Vector3(0,-21,0);

 void Start() {
     player = GetComponent<PlayerCharacter>();
     anim = player.animator;
     cc = GetComponent<CharacterController>();
 }

 void Update() {

     Vector3 movementDirection = UpdateInput();
     UpdateJump();

     if (movementDirection != Vector3.zero) {
         cc.Move((transform.forward * movementSpeed + new Vector3(0, currentJumpForce, 0) + gravity) * Time.deltaTime);
         transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(movementDirection), Time.deltaTime * rotationSpeed); // rotate character to movement direction
     } else {
         cc.Move((new Vector3(0, currentJumpForce, 0)+gravity) * Time.deltaTime); // call this even we're not moving to apply gravity and jump force
     }
     anim.SetFloat("MovementSpeed", cc.velocity.magnitude); // play idle/walk/run animation
 }


 Vector3 UpdateInput() {
     Vector3 movementDirection = Vector3.zero;
     if (Input.GetKey(KeyCode.W)) {
         movementDirection += Vector3.forward;
     }
     if (Input.GetKey(KeyCode.S)) {
         movementDirection += -Vector3.forward;
     }
     if (Input.GetKey(KeyCode.D)) {
         movementDirection += Vector3.right;
     }
     if (Input.GetKey(KeyCode.A)) {
         movementDirection += -Vector3.right;
     }

     if (Input.GetKey(KeyCode.LeftShift)) {
         movementSpeed = runSpeed;
     } else {
         movementSpeed = walkSpeed;
     }
     return movementDirection;
 }

 void UpdateJump() {
     if (cc.isGrounded) { // make sure we're touching the ground before jumping
         if (jumpTimer <= 0 && jumpStartDelayTimer <= 0) { // are we already jumping?
             if (Input.GetKey(KeyCode.Space)) {
                 jumpStartDelayTimer = jumpStartDelay;
                 anim.SetBool("Jumping", true);// start jump animation
             } else {
                 anim.SetBool("Jumping", false); // we are not jumping and not pressing space -> disable jump animation
             }
         }
     }
     if (jumpTimer > 0) {
         jumpTimer -= 1 * Time.deltaTime;
     }
     if (jumpStartDelayTimer > 0) { // delay the jump to match with animation 
         jumpStartDelayTimer -= 1 * Time.deltaTime;
         if (jumpStartDelayTimer <= 0) {
             currentJumpForce = jumpForce; // start actual jump
             jumpTimer = jumpTime;
         }
     }
     if (currentJumpForce > 0) {
         currentJumpForce += gravity.y * Time.deltaTime; // reduce jump force
         currentJumpForce = Mathf.Clamp(currentJumpForce, 0, float.MaxValue); // make sure jumpfore doesn't go negative
     }
     else if (Input.GetKey("e"))
     {
         transform.Rotate(Vector3.up * 45 * movementSpeed * Time.deltaTime);
     }
     if (Input.GetKey("q"))
     {
         transform.Rotate(-Vector3.up * 45 * movementSpeed * Time.deltaTime);
     }
 }

}