code: func splitToSubN(s string, n int) []string {
  	subs := make([]string, 0, len(s)/n+1)
  	for len(s) > n {
  		subs = append(subs, s[:n])
  		s = s[n:]
  	}
  	subs = append(subs, s)
  	return subs
  }
docs: // splitToSubN splits a string every n runes into a string[]