Urgent: Moving XML text whilst filtering the node tree

I'm trying to filter out empty font nodex from an HMTL doc that has been loaded into an XML doc.

My XML looks like this:

<root>
<font>
  <font color="#141414">
    <font>
      <font></font>
    </font><font></font><font> </font>(I need this text in the outer font)
  </font>
</font>
</root>

and I need it to look like this:

<root>
  <font color="#141414"> (I need this text in the outer font)</font>
</root>

Note the space from the inner font node has also been moved.

I wrote a console app using a recursive function found on SO but it doesn't work. I can't use Linq to XML nor any third party libraries. I'm a bit lost.

This was my console app:

class Program
    {
        static void Main(string[] args)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<root><font><font color=\"#141414\"><font><font></font></font><font></font><font> </font>(I need this text in the outer font)</font></font></root>");
            XmlNode node = doc.SelectSingleNode("root");
            RemoveEmptyFontTags(node.ChildNodes);
        }

        private static void RemoveEmptyFontTags(XmlNodeList nodes)
        {
            foreach(XmlNode node in nodes)
            {
                RemoveEmptyFontTags(node.ChildNodes);
                if(node.Name.ToLower() == "font" && node.Attributes.Count == 0)
                {
                    node.ParentNode.InnerXml = node.InnerXml;
                }                
            }
        }
    }​