You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: label.go
    path of file: ./repos/LeetCode-Go/ctl
    
    the code of the file until where you have to start completion: package main

import (
	"bufio"
	"errors"
	"fmt"

    
func delPreNext() {
	// Chpater one del pre-next
	delPreNextLabel(chapterOneFileOrder, []int{}, "ChapterOne")
	// Chpater two del pre-next
	delPreNextLabel(chapterTwoFileOrder, []int{}, "ChapterTwo")
	// Chpater three del pre-next
	delPreNextLabel(chapterThreeFileOrder, []int{}, "ChapterThree")
	// Chpater four del pre-next
	chapterFourFileOrder, solutionIds := getChapterFourFileOrder()
	delPreNextLabel(chapterFourFileOrder, solutionIds, "ChapterFour")
}