code: func deleteESuffixPrecededByNonVowel(s []rune, r1 int) ([]rune, bool) {
  	if i := len(s) - 1; i >= r1 && s[i] == 'e' && !isVowelAt(s, i-1) {
  		s = s[:i]
  		return s, true
  	}
  	return s, false
  }
docs: // Delete suffix e if in R1 and preceded by a non-vowel