string.Truncate extension method that if longer than the specific maximum truncates the string and adds `…` character (tree dots)

Truncate.cs

static class StringExt
{
    public static string? Truncate(this string? value, int maxLength)
    {
        if (value == null) return value;
        return value.Length <= maxLength ? value : string.Concat(value.AsSpan(0, maxLength - 1), "…");
    }
}