Add double quotation for golang csv encoding

golang_csv_encode_double_quotes

package main

import (
	"fmt"
	"bytes"
	"encoding/csv"
	"strings"

	"github.com/gocarina/gocsv"
)

type Client struct { // Our example struct, you can use "-" to ignore a field
	Id      string `csv:"client_id"`
	Name    string `csv:"client_name"`
	Age     string `csv:"client_age"`
	NotUsed string `csv:"-"`
}

//base data
func basedata() []*Client {
	clients := []*Client{}
	clients = append(clients, &Client{Id: "12", Name: "John", Age: "21"}) // Add clients
	clients = append(clients, &Client{Id: "13", Name: "Fred"})
	clients = append(clients, &Client{Id: "14", Name: "James", Age: "32"})
	clients = append(clients, &Client{Id: "15", Name: "Danny"})
	return clients
}

//add double quotation
func convert(b *bytes.Buffer) ([]byte, error) {
        //retry to decode, to check ""
        reader := csv.NewReader(b)
        reader.LazyQuotes = true
        lines, err := reader.ReadAll()
        if err != nil {
                return []byte{}, err
        }

        //rewrite to add "", escape \"
        bytes := make([]byte, 0, len(b.Bytes())*2)

        //If you update writer by SetCSVWriter, please change the delimiter which you use
        delimiter := ','
        //If you update writer by SetCSVWriter, please change the crlf which you use
        for _, line := range lines {
                for i, part := range line {
                        if i != 0 {
                                bytes = append(bytes, byte(delimiter))
                        }
                        bytes = append(bytes, []byte(escape(part))...)
                }
                bytes = append(bytes, byte('\r'))
        }
        return bytes, nil
}

func escape(part string) string {
        //"XXX" => XXX
        escapeStr := strings.Replace(part, "\"", "\"\"", -1)
        return "\"" + escapeStr + "\""
}

func main() {
	clients := basedata()
	out := bytes.Buffer{}
	err := gocsv.Marshal(&clients, &out) // Get all clients as CSV string
	if err != nil {
		panic(err)
	}
	csvContent, _ := convert(&out)
	fmt.Println(string(csvContent)) // Display all clients as CSV string

}

It uses gocsv package.
Please see here to run running code
Reference: golangでCSV出力時、要素をダブルクオートでくくることができない

Explain more details:
Golangでcsvの要素をダブルクオートでくくる