Solution: Count Vowel Substrings of a String

Statement

Given a string word, count how many substrings of word are vowel substrings.

A substring is a contiguous segment of word. A substring is considered a vowel substring if it contains only vowels and includes each of the five vowels a, e, i, o, and u at least once.

Return the total number of vowel substrings in word.

Constraints:

• $1 \leq$ word.length $\leq 100$

• ...