go version go1.17.8 windows/amd64

func getcsvData(filePath string) [][]string {

	f, err := os.Open(filePath)
	if err != nil {
		log.Fatal("Unable to read input file "+filePath, err)
	}
	defer f.Close()

	csvReader := csv.NewReader(f)
	records, err := csvReader.ReadAll()
	if err != nil {
		log.Fatal("Unable to parse file as CSV for "+filePath, err.Error())
	}

	return records
}


func writeback(){
records := getcsvData(file)
	
	sorted, err := os.OpenFile("new.csv", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0777)
	if err != nil {
		panic(err.Error())
	}

	sortedwriter := csv.NewWriter(sorted)
	for _, item := range records {
		if err = sortedwriter.Write(item); err != nil {
			panic(err)
		}
	}
	sortedwriter.Flush()
	sorted.Close()
}