Converti XLSX in XLS

// For complete examples and data files, please go to https://github.com/aspose-cells-cloud/aspose-cells-cloud-go/
    package main
    import (
	    "os"
	    asposecellscloud "github.com/aspose-cells-cloud/aspose-cells-cloud-go/v22"
    )
    func main() {
	    instance := asposecellscloud.NewCellsApiService(os.Getenv("ProductClientId"), os.Getenv("ProductClientSecret"))
	    file, err := os.Open("Book1.xlsx")
	    if err != nil {
		    return
	    }
	    convertWorkbookOpts := new(asposecellscloud.CellsWorkbookPutConvertWorkbookOpts)
	    convertWorkbookOpts.Format = "xls"
	    value, response, err1 := instance.CellsWorkbookPutConvertWorkbook(file, convertWorkbookOpts)
	    if err1 != nil {
		    return
	    }
	    file1, err2 := os.Create("Dest.xls")
	    if err2 != nil {
		    return
	    }
	    if _, err3 := file1.Write(value); err3 != nil {
		    return
	    }
	    file1.Close()
    }