snowballword/snowballword.go
func (w *SnowballWord) RemoveLastNRunes(n int) {
	w.RS = w.RS[:len(w.RS)-n]
	w.resetR1R2()
}
func (w *SnowballWord) RemoveLastNRunes(n int) {
	w.RS = w.RS[:len(w.RS)-n]
	w.resetR1R2()
}
// Remove the last `n` runes from the SnowballWord.
//