A simple way to convert the stupid .xls of Contoarancio to a more sensible .csv

contoarancio.go

package main

import (
	"encoding/csv"
	"os"

	"golang.org/x/net/html"
)

func main() {
	input, err := os.Open("contoarancio.xls")
	if err != nil {
		panic(err)
	}

	doc, err := html.Parse(input)
	if err != nil {
		panic(err)
	}

	output, err := os.Create("contoarancio.csv")
	if err != nil {
		panic(err)
	}
	defer output.Close()
	writer := csv.NewWriter(output)
	defer writer.Flush()

	row := doc.FirstChild.FirstChild.NextSibling.FirstChild.FirstChild.FirstChild

	for row != nil {
		if row.FirstChild.FirstChild == nil {
			break
		}
		dataContabile := row.FirstChild.FirstChild.Data
		dataValuta := row.FirstChild.NextSibling.FirstChild.Data
		causale := row.FirstChild.NextSibling.NextSibling.FirstChild.Data
		descrizione := row.FirstChild.NextSibling.NextSibling.NextSibling.FirstChild.Data
		importo := row.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.FirstChild.Data

		writer.Write([]string{dataContabile, dataValuta, causale, descrizione, importo})

		row = row.NextSibling
	}
}