The 'u' tag seems not to be working i dont knw why

Can I see your new code?

Because I tested it on my end and it passed for me.

Here is how to write code into the forum

When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).