Read file

func ReadFile(filename string) ([]string, error) {
  f, err := os.Open(filename)
  if err != nil {
    return nil, err
  }
  defer f.Close()
  lines := []string{}
  scanner := bufio.NewScanner(f)
  for scanner.Scan() {
    lines = append(lines, scanner.Text())
  }
  return lines, scanner.Err()
}