Find common prefix of strings

by 
string[] xs = new[] { "h:/a/b/c", "h:/a/b/d", "h:/a/b/e", "h:/a/c" };

string x = string.Join("https://stackoverflow.com/", xs.Select(s => s.Split("https://stackoverflow.com/").AsEnumerable())
                              .Transpose()
                              .TakeWhile(s => s.All(d => d == s.First()))
                              .Select(s => s.First()));

with

public static IEnumerable<IEnumerable<T>> Transpose<T>(
    this IEnumerable<IEnumerable<T>> source)
{
    var enumerators = source.Select(e => e.GetEnumerator()).ToArray();
    try
    {
        while (enumerators.All(e => e.MoveNext()))
        {
            yield return enumerators.Select(e => e.Current).ToArray();
        }
    }
    finally
    {
        Array.ForEach(enumerators, e => e.Dispose());
    }
}

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