请重新布局这两段代码的结构，保持代码的功能和逻辑不变，暂不做内容上的修改。
```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>购物车</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <header>
        <h1>欢迎来到我的购物车</h1>
    </header>
    <main>
        <section id="cart">
            <h2>购物车内容</h2>
            <ul id="cart-items">
                <li>商品1 - ¥100</li>
                <li>商品2 - ¥200</li>
                <li>商品3 - ¥300</li>
            </ul>
        </section>
        <section id="checkout">
            <h2>结算</h2>
            <button id="checkout-btn">去结算</button>
        </section>
    </main>
    <footer>
        <p>版权所有 &copy; 2023</p>
    </footer>
    <script src="script.js"></script>
</body>
</html>
```

```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>商品列表</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <header>
        <h1>欢迎来到我的商品列表</h1>
    </header>
    <main>
        <section id="products">
            <h2>商品列表</h2>
            <ul id="product-items">
                <li>商品A - ¥100</li>
                <li>商品B - ¥200</li>
                <li>商品C - ¥300</li>
            </ul>
        </section>
        <section id="add-to-cart">
            <h2>添加到购物车</h2>
            <button id="add-cart-btn">添加到购物车</button>
        </section>
    </main>
    <footer>
        <p>版权所有 &copy; 2023</p>
    </footer>
    <script src="script.js"></script>
</body>
</html>
```
user
```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <header>
        <h1>欢迎来到我的购物车</h1>
    </header>
    <main>
        <section id="cart">
            <h2>购物车内容</h2>
            <ul id="cart-items">
                <li>商品1 - ¥100</li>
                <li>商品2 - ¥200</li>
                <li>商品3 - ¥300</li>
            </ul>
        </section>
        <section id="checkout">
            <h2>结算</h2>
            <button id="checkout-btn">去结算</button>
        </section>
    </main>
    <footer>
        <p>版权所有 &copy; 2023</p>
    </footer>
    <script src="script.js"></script>
</body>
</html>

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <header>
        <h1>欢迎来到我的商品列表</h1>
    </header>
    <main>
        <section id="products">
            <h2>商品列表</h2>
            <ul id="product-items">
                <li>商品A - ¥100</li>
                <li>商品B - ¥200</li>
                <li>商品C - ¥300</li>
            </ul>
        </section>
        <section id="add-to-cart">
            <h2>添加到购物车</h2>
            <button id="add-cart-btn">添加到购物车</button>
        </section>
    </main>
    <footer>
        <p>版权所有 &copy; 2023</p>
    </footer>
    <script src="script.js"></script>
</body>
</html>
```
assistant