Shift array

Shift array:

public static int?[] ShiftArray(int?[] ins)
 {
  if (ins == null || ins.Length == 0) { return ins; }
  var outs = new int?[ins.Length];
  Array.Copy(ins, 1, outs, 0, ins.Length - 1);
  outs[outs.Length - 1] = ins[0];
  return outs;
 }

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