WordFlow Detector v2 (ChatGPT)

using System.Collections.Generic;

public class WordFlowDetector
{
    private HashSet<char> vowels = new HashSet<char> { 'a', 'e', 'i', 'o', 'u', 'y' };

    public bool IsWellFlowed(string word)
    {
        List<string> syllables = SplitIntoSyllables(word);
        bool isVowelStart = false;

        foreach (string syllable in syllables)
        {
            bool isSyllableWellFlowed = IsSyllableWellFlowed(syllable, isVowelStart);
            if (!isSyllableWellFlowed)
                return false;

            isVowelStart = !isVowelStart;
        }

        return true;
    }

    private List<string> SplitIntoSyllables(string word)
    {
        List<string> syllables = new List<string>();
        StringBuilder currentSyllable = new StringBuilder();

        for (int i = 0; i < word.Length; i++)
        {
            char currentChar = word[i];
            currentSyllable.Append(currentChar);

            if (i == word.Length - 1 || IsVowel(currentChar) != IsVowel(word[i + 1])))
            {
                syllables.Add(currentSyllable.ToString());
                currentSyllable.Clear();
            }
        }

        return syllables;
    }

    private bool IsSyllableWellFlowed(string syllable, bool isVowelStart)
    {
        bool isVowelExpected = IsVowel(syllable[0]) == isVowelStart;

        for (int i = 0; i < syllable.Length; i++)
        {
            if (IsVowel(syllable[i]) != isVowelExpected)
                return false;
        }

        return true;
    }

    private bool IsVowel(char c)
    {
        return vowels.Contains(c);
    }
}