Selecting and deselecting gameobject to change material

Hello,

I am having some issues with my code. I am trying to create a highlighting feature so a player can click on a game object and see what they have selected.

• I would like it to stay highlighted till they select another object.

• when they select another object the default material would be applied back to the previous gameobject. and it would continue for each object them select and deselect.

  ---

can anyone help me. I've tried a few things but it just keeps the color the same.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SelectionManager : MonoBehaviour
 {
     [SerializeField] private string selectableTag = "Selectable";
     [SerializeField] private Material highlightMaterial;
 
     private Material originalMaterial;
 
     private GameObject selected;
     private GameObject oldSelected;
 
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         Renderer selectionRenderer;
 
         //change the color to the highlight
         if (Input.GetMouseButtonDown(0))
         {
             //if selected set to highlight color
             var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             RaycastHit hit;
             if (Physics.Raycast(ray, out hit, 300.0f))
             {
                 selected = hit.transform.gameObject;
                 Debug.Log("1111 new Selection --> " + selected);
 
                 if (selected.CompareTag(selectableTag))
                 {
                     if(selected != oldSelected || oldSelected == null)
                     {
                         //save the original material
                         selectionRenderer = selected.GetComponent<Renderer>();
                         originalMaterial = selectionRenderer.material;
                         selectionRenderer.material = highlightMaterial;
 
                         
                         Debug.Log("Old Selection --> " + oldSelected);
                         Debug.Log("new Selection --> " + selected);
                     }
                     else
                     {
                         oldSelected = selected;
                         Debug.Log("you have selected a new building");
                         oldSelected.GetComponent<Renderer>().sharedMaterial = originalMaterial;
                     }
 
                     //comment 2
 
                 }
 
             }
             //comment 3
 
         }
 
 
         //comment1
 
     }
 
 
     void ClearSelection()
     {
         if (selected == null)
         {
             return;
         }
         else
         {
             selected.GetComponent<Renderer>().sharedMaterial = originalMaterial;
             selected = null;
         }
     }
 }