using System.Text;
using System.Text.RegularExpressions;

public static class StringExtensions
{
    public static string StripExtraSpaces(this string s)
    {
        if (string.IsNullOrEmpty(s))
            return string.Empty;

        Regex r = new Regex(@"\s+");//remove all whitespace
        s = r.Replace(s, " ");	// to a single space

        return s;
    }
}