why [ newTodo.innerText= todoInput.value ] is not working? help me out wity my Todo List

this is my html

<!DOCTYPE html>
    <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta http-equiv="X-UA-Compatible" content="IE=edge">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>Todo List</title>
            <link rel="stylesheet" href="todo.css">
            <script src="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/js/all.min.js"></script>
        </head>
        
        <body>
            <header>
                <h1>The TodoList for learning JavaScript</h1>
            </header>
            <FORM>
                <input type="text" class="todo-input" id="text" placeholder="Write it all here..." />
                <button class="todo-button"  type="submit">
                    <i class="fas fa-plus-square fa-3x"></i>
                </button>
            </FORM>
            <div class="Ul-stuff">
                <ul class="todo-list"></ul>
            </div>
          
            <script src="/todo.js"></script>
        </body>
    </html>

This is my JavaScript I am writing a to-do list later I want to make it more advance but I am stuck with a really small problem here with the javascript. here are all the codes for getting the input value I am using it like this... it's not working,is there any alternate I could use, or if there is some mistake in my code please show me

//selectors
        
var todoInput = document.querySelector('todo-input');
var btn = document.querySelector('.todo-button');
var todoList = document.querySelector('.todo-list');
            
console.log(todoInput);

// eventListeners
            
btn.addEventListener('click', addTodo);
            
// functions
            
function addTodo(event) {
    console.log('hellooo')
    //prevent from refreshing the page
    event.preventDefault();
    // Todo DIV
    var todoDiv = document.createElement('div');
    todoDiv.classList.add("todo");
    var newTodo = document.createElement('li');

    // for getting the input value i am using it like this...its not working ,is there any alternate i could use or if there is some mistake in my code please show me :
    newTodo.innerText= todoInput.value
          
    newTodo.classList.add("todo-item");
    todoDiv.appendChild(newTodo);
            
    // button (1)
    var doneBtn =document.createElement('button');
    doneBtn.innerHTML = '<i class="fas fa-check""></i>' 
    doneBtn.classList.add('done-Btn');
    todoDiv.appendChild(doneBtn);
            
    // button (2)
    var delBtn =document.createElement('button');
    delBtn.innerHTML = '<i class="fas fa-trash""></i>' 
    delBtn.classList.add('del-Btn');
    todoDiv.appendChild(delBtn);
            
    //append to list
    todoList.appendChild(todoDiv);

    //clear todo input value
}

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