The Hourglass Pattern

Temporal Symmetry

An hourglass consists of a full downward triangle followed by a full upward triangle, sharing a single-star center.

The Assignment

Your function receives width (must be odd).

1. First block: Draw downward triangle (from width stars down to 1).
2. Second block: Draw upward triangle (from 3 stars up to width).
3. Correct leading spaces for every row to center the stars.