Problem

First Repeated Word Finder

Description

Given a sentence, find the first repeated word. The function should return the first repeated word or a standardized indication that no repeats were detected.

Example:

We work hard because hard work pays

Output:

hard

Constraints:

• The sentence contains only printable ASCII characters.
• The sentence may contain leading or trailing spaces.
• The sentence may contain multiple consecutive spaces between words.
• The function should be case-insensitive.
• The function should ignore delimiters when comparing words.