Prevent player from goes through the wall

Hi guys, I want to ask a question. First of all, I already can detect the player while the player hit the wall, but I could not make the player not goes through the wall. How could I make the player to stop moving while the player hit the wall?

Here is the screenshot (Red capsule is the player):

The first image where the capsule is collided with the brown wall is the imported object from 3ds max and I already applied the collider by ticking the check box as shown on the above image.

Here is the code that I am using:

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(CharacterController))]
 
 public class CheckPlayer : MonoBehaviour 
 {
     public float moveSpeed = 5.0f, rotationSpeed = 5.0f; // Define and set for the movement and rotation of the player
 
     private void Update()
     {
         // Call the Movement and Rotation function
 
         Movement();
 
         Rotation();
     }
 
     private void OnTriggerEnter(Collider col)
     {
         // If the game object collided with the certain tag
         if (col.gameObject.tag == "Inn's Objects")
         {
             // Debug it
             Debug.Log("You have collided with the object");
         }
 
         // If the game object colided with the certain tag
         if (col.gameObject.tag == "Inn's Door")
         {
             // Load another level
             GameManager.LoadLevel("Third Loading Scene");
         }
     }
 
     private void Movement()
     {
         // If user press W on the keyboard
         if (Input.GetKey(KeyCode.W))
         {
             // Move the player forward
             transform.position -= Vector3.forward * moveSpeed * Time.deltaTime;
         }
 
         // But if user press A on the keyboard
         else if (Input.GetKey(KeyCode.A))
         {
             // Move the player to the right
             transform.position += Vector3.right * moveSpeed * Time.deltaTime;
         }
 
         // But if user press S on the keyboard
         else if (Input.GetKey(KeyCode.S))
         {
             // Move the player backward
             transform.position += Vector3.forward * moveSpeed * Time.deltaTime;
         }
 
         // But if user press D on the keyboard
         else if (Input.GetKey(KeyCode.D))
         {
             // Move the player to the left
             transform.position -= Vector3.right * moveSpeed * Time.deltaTime;
         }
     }
 
     private void Rotation()
     {
         // If user press E on the keyboard
         if (Input.GetKey(KeyCode.E))
         {
             // Rotate the player to the right
             transform.Rotate(-Vector3.up * rotationSpeed * Time.deltaTime);
         }
 
         // But if user press Q on the keyboard
         else if (Input.GetKey(KeyCode.Q))
         {
             // Rotate the player to the left
             transform.Rotate(Vector3.up * rotationSpeed * Time.deltaTime);
         }
     }
 }

Any help would be much appreciated!

Thank you