helper.go

package main

import (
	"bufio"
	"math/rand"
	"os"
)

func randomString(n int) string {
	letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
	b := make([]rune, n)
	for i := range b {
		b[i] = letters[rand.Intn(len(letters))]
	}
	return string(b)
}

func readFile(filename string) ([]string, error) {
	var ret []string
	file, err := os.Open(filename)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	// optionally, resize scanner's capacity for lines over 64K, see next example
	for scanner.Scan() {
		ret = append(ret, scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		return nil, err
	}

	return ret, nil
}