Dropdown Navigation Menu

Please help me write the code macro nav_loop(page) for the Dropdown Navigation Menu.
Menu structure

NOT ROUTABLE parent {

NOT ROUTABLE sub parent 1 {
children item 1
children item 2
}

NOT ROUTABLE sub parent 2 {
children item 3
children item 4
}

}

html code

<nav>
<div>
    <ul class="uk-navbar-nav">
        <li>
            <a href="not-routable-parent">NOT ROUTABLE parent</a>
			<div class="dropdown-width-2">
				<div class="width-1-2">
					<div>
						<ul>
							<li><a href="not-routable-parent/not-routable-sub-parent-1">NOT ROUTABLE sub parent 1</a></li>
							<li><a href="not-routable-parent/not-routable-sub-parent-1/item-1">children item 1</a></li>
							<li><a href="not-routable-parent/not-routable-sub-parent-1/item-2">children item 2</a></li>
						</ul>
					</div>
					<div>
						<ul>
							<li><a href="not-routable-parent/not-routable-sub-parent-2">NOT ROUTABLE sub parent 2</a></li>
							<li><a href="not-routable-parent/not-routable-sub-parent-2/item-3">children item 1</a></li>
							<li><a href="not-routable-parent/not-routable-sub-parent-2/item-4">children item 2</a></li>
						</ul>
					</div>
				</div>
			/div>
        </li>
    </ul>
</div>
</nav>

I am ready to pay for help.