Empty triangle X28608

Statement

Dessign a function @empty_triangle(n)@ that given an int value $n>2$ writes an empty triangle of height $n$ .

The statement asks for a function that writes something, thus in this problem print will be used instead of return.

Sample session

>>> empty_triangle(3)
  *
 * *
*****
>>> empty_triangle(5)
    *
   * *
  *   *
 *     *
*********

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