func (e *Goexcel) CopyStyle(oldkey string, newkey string) {
sold := e.Style[oldkey]
if sold.Font.Name == "" {
panic("Style " + oldkey + " not found or Font Name not defined")
}
style := new(xlsx.Style)
style.Alignment = sold.Alignment
style.ApplyAlignment = sold.ApplyAlignment
style.ApplyBorder = sold.ApplyBorder
style.ApplyFill = sold.ApplyFill
style.ApplyFont = sold.ApplyFont
style.Border = sold.Border
style.Fill = sold.Fill
style.Font = sold.Font
e.Style[newkey] = style
}
