     func fprintTable(w io.Writer, db []person) error {
        const header = `<html>
      <head>
        <title>Important Contacts</title>
      </head>
      <body>
        <table border=1 style="width:100%%">
          <tr><th>Name</th><th>Address</th><th>First Number</th><th>Second Number</th></tr>
    `
        if _, err := fmt.Fprintf(w, header); err != nil {
            return err
        }
        for _, p := range db {
            if _, err := fmt.Fprintf(w, "      <tr><td>%s %s</td>", p.FirstName, p.FamilyName); err != nil {
                return err
            }
            if _, err := fmt.Fprintf(w, "<td>%s %s</td>", p.Address.House, p.Address.Street); err != nil {
                return err
            }
            for _, num := range p.PhoneNumbers {
                if _, err := fmt.Fprintf(w, "<td>%s</td>", num); err != nil {
                    return err
                }
            }
            if _, err := fmt.Fprintf(w, "</tr>\n"); err != nil {
                return err
            }
        }
        if _, err := fmt.Fprintf(w, "    </table>\n  </body>\n</html>\n"); err != nil {
            return err
        }
        return nil
    }