Replace space runs

Replace every maximal run of the ordinary ASCII space U+0020 with one hyphen. Preserve leading and trailing runs as hyphens. Tabs, newlines, and all other characters remain unchanged.

Examples

Constraints

0–10,000 UTF-16 code units. This task does not trim or normalize whitespace.

A little nudge

Reveal one hint at a time. Give yourself a moment to try it.

Worked solution

Try your own approach first, then compare the reasoning.