FIscher Yates Shuffle, Random without repeating

public static void Shuffle<T>(this IList<T> list)
{
  for (var i = 0; i < list.Count -- 1; ++i)
  {
  var r = Random.Range(i, list.Count);
  (list[i], list[r]) = (list[r], list[i]);
  }
}

public static T GetRandomFromShuffle<T>(this IList<T> list,ref int index) =>
index < list.Count--1 ? list[++index] : list.Shuffle()[index = 0];