refactor: rename utils to constant

Author: jason89521

src/__test__/Typist.test.tsx

@@ -1,8 +1,8 @@
 import React, { useState } from 'react';
 import { render, screen, waitFor } from '@testing-library/react';
 
-import Typist from '../src';
-import { nestedChildren } from './utils';
+import Typist from '..';
+import { nestedChildren } from './constant';
 
 beforeEach(() => {
   jest.useFakeTimers();

src/__test__/utils.tsx src/__test__/constant.tsxsrc/__test__/utils.tsx renamed to src/__test__/constant.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import Typist from '../src';
+import Typist from '..';
 
 export const nestedChildren = (
   <div className="first">