Golang problem solving template

template.vm

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func (in *${NAME}) run() {
    #[[$END$]]#
}

func main() {
	file, err := os.Open("input.txt")
	var F *bufio.Reader
	if err == nil {
		F = bufio.NewReader(file)
		os.Stdin = file
	} else {
		F = bufio.NewReader(os.Stdin)
	}
	defer func(file *os.File) {
		_ = file.Close()
	}(file)
	New${NAME}(F).run()
}

func New${NAME}(r *bufio.Reader) *${NAME} {
	return &${NAME}{
		sc:        r,
		split:     []string{},
		index:     0,
		separator: " ",
	}
}

type ${NAME} struct {
	sc        *bufio.Reader
	split     []string
	index     int
	separator string
}

func (in *${NAME}) GetLine() string {
	line, err := in.sc.ReadString('\n')
	if err != nil {
		fmt.Println("error line:", line, " err: ", err)
	}
	in.split = []string{}
	in.index = 0
	return line
}

func (in *${NAME}) load() {
	if len(in.split) <= in.index {
		in.split = strings.Split(in.GetLine(), in.separator)
		in.index = 0
	}
}

func (in *${NAME}) nextInt() int {
	in.load()
	val, _ := strconv.Atoi(strings.TrimSpace(in.split[in.index]))
	in.index++
	return val
}

func (in *${NAME}) nextInt64() int64 {
	in.load()
	val, _ := strconv.ParseInt(strings.TrimSpace(in.split[in.index]), 10, 64)
	in.index++
	return val
}

func (in *${NAME}) nextString() string {
	in.load()
	val := strings.TrimSpace(in.split[in.index])
	in.index++
	return val
}