diff --git a/src/hooks.ts b/src/hooks.ts
index 71e2a36..b51a2a6 100644
--- a/src/hooks.ts
+++ b/src/hooks.ts
@@ -11,55 +11,83 @@ import {
   CardT,
   SubjectT,
 } from "./types/timetable";
-import { initialEventLessonsGenrator } from './utils/timetable'
+import { initialEventLessonsGenrator } from "./utils/timetable";
 
 export const useTimetable: UseTimetableHookFT = () => {
-  const [cardState, setCardState] = useState<CardT[]>([])
-  const [dayState, setDayState] = useState<DayT[]>([])
-  const [subjectState, setSubjectState] = useState<SubjectT[]>([])
+  const [cardState, setCardState] = useState<CardT[]>([]);
+  const [dayState, setDayState] = useState<DayT[]>([]);
+  const [subjectState, setSubjectState] = useState<SubjectT[]>([]);
   // const [startDateState, setStartDateState] = useState<number>(0)
 
   const createSubject: CreateSubjectFT = (title, teachers) => {
-    setSubjectState((prev) => ([...prev, { title, teachers }]))
+    setSubjectState(prev => [...prev, { title, teachers }]);
   };
 
   const createCard: CreateCardFT = (subject, teacher, room) => {
-    setCardState((prev) => ([...prev, { subject, teacher, room }]))
+    setCardState(prev => [...prev, { subject, teacher, room }]);
   };
 
-  const createDay: CreateDayFT = (date) => {
-    setDayState((prev) => [...prev, { date, events: [] }])
-  }
+  const createDay: CreateDayFT = date => {
+    setDayState(prev => [...prev, { date, events: [] }]);
+  };
 
-  const addEvent: AddEventFT = (dayId) => {
-    setDayState((days) => days.map((day, i) => (i == dayId) ? { ...day, events: [...day.events, { lessons: initialEventLessonsGenrator() }] } : day))
-  }
-
-  const addLesson: AddLessonFT = (dayId, eventId, groupId, isPair, lessonId, lessonNumber) => {
-    setDayState((days) => days.map(
-      (day, dayIndex) => (
-        (dayIndex == dayId) ? {
-          ...day,
-          events: day.events.map(
-            (event, eventIndex) => (
-              (eventIndex == eventId) ? {
-                lessons: event.lessons.map(
-                  (lesson, lessonIndex) => (
-                    (lessonIndex == groupId) ? (
-                      (isPair) ? [lessonId, lessonId] : lesson.map((lessonElement, lessonElementIndex) => (
-                        (lessonElementIndex == lessonNumber) ? lessonId : lessonElement
-                      ))
-                    ) : lesson
-                  )
-                )
-              } : event
-            )
-          )
-        } : day
+  const addEvent: AddEventFT = dayId => {
+    setDayState(days =>
+      days.map((day, i) =>
+        i == dayId
+          ? {
+              ...day,
+              events: [
+                ...day.events,
+                { lessons: initialEventLessonsGenrator() },
+              ],
+            }
+          : day
       )
-    ))
-  }
+    );
+  };
 
+  const addLesson: AddLessonFT = (
+    dayId,
+    eventId,
+    groupId,
+    isPair,
+    lessonId,
+    lessonNumber
+  ) => {
+    setDayState(days =>
+      days.map((day, dayIndex) =>
+        dayIndex == dayId
+          ? {
+              ...day,
+              events: day.events.map((event, eventIndex) =>
+                eventIndex == eventId
+                  ? {
+                      lessons: event.lessons.map((lesson, lessonIndex) =>
+                        lessonIndex == groupId
+                          ? isPair
+                            ? [lessonId, lessonId]
+                            : lesson.map((lessonElement, lessonElementIndex) =>
+                                lessonElementIndex == lessonNumber
+                                  ? lessonId
+                                  : lessonElement
+                              )
+                          : lesson
+                      ),
+                    }
+                  : event
+              ),
+            }
+          : day
+      )
+    );
+  };
 
-  return { state: { cards: cardState, subjects: subjectState, days: dayState }, createCard, createSubject, createDay, addLesson };
+  return {
+    state: { cards: cardState, subjects: subjectState, days: dayState },
+    createCard,
+    createSubject,
+    createDay,
+    addLesson,
+  };
 };
diff --git a/src/types/timetable.ts b/src/types/timetable.ts
index 2b8d64d..b75e80f 100644
--- a/src/types/timetable.ts
+++ b/src/types/timetable.ts
@@ -36,7 +36,14 @@ export type CreateDayFT = (date: number) => void;
 
 export type AddEventFT = (dayId: number) => void;
 
-export type AddLessonFT = (dayId: number, eventId: number, groupId:number, isPair: boolean, lessonId: number, lessonNumber?: number) => void;
+export type AddLessonFT = (
+  dayId: number,
+  eventId: number,
+  groupId: number,
+  isPair: boolean,
+  lessonId: number,
+  lessonNumber?: number
+) => void;
 
 export type UseTimetableHookFT = () => {
   createSubject: CreateSubjectFT;
diff --git a/src/utils/timetable.ts b/src/utils/timetable.ts
index 97126ee..0c8d40e 100644
--- a/src/utils/timetable.ts
+++ b/src/utils/timetable.ts
@@ -1,2 +1,2 @@
 export const initialEventLessonsGenrator = () =>
-	Array(6).map<number[]>(() => [0, 0])
\ No newline at end of file
+  Array(6).map<number[]>(() => [0, 0]);