/// <summary>
/// Joins the <paramref name="chars"/> with <paramref name="separator"/> into a string.
/// </summary>
/// <param name="chars">The <see cref="Char[]"/> to join.</param>
/// <param name="separator">The <see cref="Char"/> to interleave.</param>
/// <returns>The joined <see cref="String"/>.</returns>
public static String Join(this Char[] chars, Char separator)
{
if (chars is null)
{
throw new ArgumentNullException(nameof(chars));
}
Char[] Result = new Char[(chars.Length * 2) - 1];
for (Int32 i = 0; i < (chars.Length * 2) - 1; i++)
{
Result[i] = i % 2 == 0 ? chars[i / 2] : separator;
}
return(Result.Join());
}