I want to swap randomly 5 blocks (block has 5 diffrent color) and spawn in vertical line

I am not at a Unity Seat right now, but something like (in C#):

     void SpawnVertical(int numberOfObjects) {
        List objectsToSpawn<int> = new List<int>(numberOfObjects);
     
        // Prepare the List
        for (int i=0; i<numberOfObjects; i++) {
           objectsToSpawn.Add(i);
        }
     
        // Spwan the objects vertically
        int cnt=numberOfObjects;
        for (int i=0; i<cnt; i++) {
           int idx = Random.Range(0, cnt-1);
           int x = objectsToSpawn.Item(idx);
           objectsToSpawn.RemoveAt(idx);
           Debug.Log(x);
           cnt--;
        }
    }