JavaScript Great Vowel harmony

CODEPEN https://codepen.io/guldus/pen/oVJdMM HTML <div class="container"> <div id="box" class="d-flex align-content-center flex-wrap"> <h2 class="text-center">Büyük Ünlü Uyumu</h2> <input type="text" id="kelime"> <button onclick="myFunction()" class="btn btn-dark">BUL</button> </div> </div> CSS body{ #box{ height:100vh; width: 200px; margin: 0 auto; input{ width: 200px; outline:none; } button{ margin: 10px auto; } } } JS let kalin_sayisi = 0; let ince_sayisi = 0; function myFunction(){...