go กับ google sheets

package main

import (
    "context"
    "fmt"
    "io/ioutil"
    "log"

    "golang.org/x/oauth2"
    "golang.org/x/oauth2/google"
    "google.golang.org/api/option"
    "google.golang.org/api/sheets/v4"
)

func main() {
    ctx := context.Background()
    b, err := ioutil.ReadFile("./ไฟล์ที่donwloadมา.json")
    if err != nil {
        log.Fatalf("Unable to read client secret file: %v", err)
    }

    config, err := google.JWTConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets")
    if err != nil {
        log.Fatalf("Unable to parse client secret file to config: %v", err)
    }
    client := config.Client(oauth2.NoContext)

    srv, err := sheets.NewService(ctx, option.WithHTTPClient(client))
    if err != nil {
        log.Fatalf("Unable to retrieve Sheets client: %v", err)
    }

    spreadsheetId := "idที่shareเอกสารมา"
    readRange := "A1:E1"
    resp, err := srv.Spreadsheets.Values.Get(spreadsheetId, readRange).Do()
    if err != nil {
        log.Fatalf("Unable to retrieve data from sheet: %v", err)
    }

    if len(resp.Values) == 0 {
        fmt.Println("No data found.")
    } else {
        fmt.Println("Name, Major:")
        for _, row := range resp.Values {
            fmt.Printf("%s, %s\n", row[0], row[4])
        }
    }

    rb := &sheets.ValueRange{
        MajorDimension: "ROWS",
        Values: [][]interface{}{
            {"AAAA"},
        },
    }

    _, err = srv.Spreadsheets.Values.Append(spreadsheetId, "Sheet1!A2:A2", rb).ValueInputOption("USER_ENTERED").Do()
    if err != nil {
        log.Fatalf("Unable to append data to sheet: %v", err)
    }
}