;;; Глобальные константы
(defconstant +glasn+ '(#\А #\Е #\Ё #\И #\О #\У #\Ы #\Э #\Ю #\Я #\а #\е #\ё #\и #\о #\у #\ы #\э #\ю #\я)
  "Список гласных букв")
(defconstant +sonorn+ '(#\Л #\М #\Н #\Р #\л #\м #\н #\р #\Й #\й)
  "Список сонорных согласных букв")
 
;;; Проверка гласной
(defun glasn (char)
  (member char +glasn+ :test #'char-equal))
 
;;; Проверка сонорного согласного
(defun sonorn (char)
  (member char +sonorn+ :test #'char-equal))
 
;;; Проверка шумного согласного (не гласная и не сонорная)
(defun shumn (char)
  (and (characterp char)
       (not (glasn char))
       (not (sonorn char))))
 
;;; Разбиение слова на слоги (упрощённый и исправленный вариант)
(defun razbit-na-slogi (word)
  (let ((slogi '())
        (current-slog '()))
    (labels ((add-slog ()
               (when current-slog
                 (push (coerce (nreverse current-slog) 'string) slogi)
                 (setf current-slog '()))))
      (dotimes (i (length word))
        (let ((char (char word i)))
          (push char current-slog)
          (when (glasn char)
            (if (<= (length current-slog) 1)
                (add-slog)
                (let* ((rev-slog (reverse current-slog))
                       (last1 (nth 0 rev-slog))  ; последний символ (гласная)
                       (last2 (nth 1 rev-slog))) ; предпоследний символ
                  (cond
                    ;; Два шумных подряд - последний переходит в следующий слог
                    ((and (shumn last1) (shumn last2))
                     (push last1 rev-slog) ;; возвращаем последний назад
                     (setf current-slog (list last1))
                     (add-slog))
                    ;; Два сонорных подряд, кроме 'й' - последний переходит в следующий слог
                    ((and (sonorn last1) (sonorn last2) (not (char-equal last1 #\й)))
                     (push last1 rev-slog)
                     (setf current-slog (list last1))
                     (add-slog))
                    ;; Иначе разделяем здесь
                    (t (add-slog))))))))
      ;; Добавляем последний слог, если остался
      (when current-slog
        (push (coerce (nreverse current-slog) 'string) slogi))
      ;; Возвращаем слоги в правильном порядке
      (nreverse slogi))))

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