Rotate non square Color array by 90 degrees

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class TextureRotate : MonoBehaviour {
 
     static Color32[] colorResult;
 
     public enum Rotate
     {
         Left,
         Right
     }
 
     public static void RotateTexture(Texture2D source, Rotate rotation)
     {
         Color32[] colorSource = source.GetPixels32();
         colorResult = new Color32[colorSource.Length];
 
         int count = 0;
         int newWidth = source.height;
         int newHeight = source.width;
         int index = 0;
 
         for (int i = 0; i < source.width; i++)
         {
             for (int j = 0; j < source.height; j++)
             {
                 if(rotation == Rotate.Left)
                     index = (source.width * (source.height - j)) - source.width + i;
                 else
                     index = (source.width * (j + 1)) - (i + 1);
                 
                 colorResult[count] = colorSource[index];
                 count++;
             }
         }
 
         source.Resize(newWidth, newHeight);
         source.SetPixels32(colorResult);
         source.Apply();
 
         colorResult = null;
     }
 }