My program in Golang prints the first input two times in the file

I try to get some CSV formatted string as input and then to print it to an actual CSV file. It works but it prints the first string 2 times.

My code looks like this:

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	n := 0
	inputFile, err := os.Create("input.csv") //create the input.csv file
	if err != nil {
		log.Fatal(err)
	}

	csvwriter := csv.NewWriter(inputFile)

	fmt.Println("How many records ?")
	fmt.Scanln(&n)
	fmt.Println("Enter the records")
	var lines [][]string
	for i := 0; i < n; i++ {
		scanner.Scan()
		text := scanner.Text()
		lines = append(lines, []string{text})
		err := csvwriter.WriteAll(lines)
		if err != nil {
			return
		}
	}
	csvwriter.Flush()
	inputFile.Close()
}

for n=2 and the records:

abcd, efgh, ijklmn
opq, rstu, vwxyz

the output looks like this:

"abcd, efgh, ijklmn"
"abcd, efgh, ijklmn"
"opq, rstu, vwxyz"

It is my first time working with Golang and I am a little bit lost

csvwriter.WriteAll(lines) WriteAll writes multiple CSV records to w using Write and then calls Flush, returning any error from the Flush.

You are appending lines every time you read in a loop and flushing to the file.

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	n := 0
	inputFile, err := os.Create("input.csv") //create the input.csv file
	if err != nil {
		log.Fatal(err)
	}
	defer inputFile.Close()

	csvwriter := csv.NewWriter(inputFile)

	fmt.Println("How many records ?")
	fmt.Scanln(&n)
	fmt.Println("Enter the records")
	var lines [][]string
	for i := 0; i < n; i++ {
		scanner.Scan()
		text := scanner.Text()
		lines = append(lines, []string{text})
	}
	err = csvwriter.WriteAll(lines)
	if err != nil {
		return
	}
	
}

You were writing the csv in loop so that first line printed double. Here is the corrected code.

package main

import (
	"bufio"
	"encoding/csv"
	"fmt"
	"log"
	"os"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	n := 0
	inputFile, err := os.Create("input.csv") //create the input.csv file
	if err != nil {
		log.Fatal(err)
	}
	defer func() {
		inputFile.Close()
	}()

	csvwriter := csv.NewWriter(inputFile)
	defer func() {
		csvwriter.Flush()
	}()
	fmt.Println("How many records ?")
	fmt.Scanln(&n)
	fmt.Println("Enter the records")
	var lines [][]string
	for i := 0; i < n; i++ {
		scanner.Scan()
		text := scanner.Text()
		lines = append(lines, []string{text})

	}
	err = csvwriter.WriteAll(lines)
	if err != nil {
		return
	}
}