cutest | C-Library for unit testing | Command Line Interface library

I've recently started learning on my own and I am stuck at this and can't get past it.

I'm trying to create a login page and for the first time I'm using middleware

I'm getting an error: throw new TypeError('app.use() requires a middleware function')

TypeError: app.use() requires a middleware function

This is the code down below:

I am building a website and I came across an issue. The footer of this page doesn't stretch to the edge of the website, like it does on this page.

Here is the HTML of the first page where the footer is displaying incorrectly.

I'm setting up Firebase Cloud Messaging to do push notifications on the web. It works but only with Chrome (Windows and Android) and Firefox(Android) so far. It's not working on Samsung Internet Browser (the browser that comes pre-installed on Samsung's phones) and I haven't gotten a chance to test on iOS so far.

I've tried adding the sender id as gcm_sender_id to the Cloud Function I'm using as well as to the manifest.json file to no avail. Below is how the notification body is set up.

I am making a 'cutest pet bracket' for my company while on quarantine, and I am confused as how to update the competitors of subsequent rounds after one round is played (somebody wins).

Say my winner is 3 and the round after is:

[[3, 14], [6, 11]]

and the round after is:

[[2, [7, 10]], [[3, 14], [6, 11]]]

I want to replace the children nodes with the winner in them to reflect the fact that now just the winner remains:

[[3, 14], [6, 11]] --> [3, [6, 11]]

[[2, [7, 10]], [[3, 14], [6, 11]]] --> [[2, [7, 10]], [3, [6, 11]]]

I came up with some code but it doesn't work properly

[[3, 14], [6, 11]] --> [[3], [6, 11]] (close, but no cigar)

[[2, [7, 10]], [[3, 14], [6, 11]]] --> [[2, [7, 10]], [[3, 14], [6, 11]]] (no change)

I am a beginner at coding, and was trying this question that replaces all repetitions of a letter in a string with a hyphen: i.e ABCDAKEA will become ABCD-KE-.I used the switch loop and it works, but i want to make it shorter and maybe use recursion to make it more effective. Any ideas?

I posted my heap implementation here earlier and got some much needed help with my add() function, which I'm beyond grateful for, but I'm still getting invalid reads and memory leaks, and could use further assistance.

heap.h header file:

I am relatively new to web development, and I am creating a website with NodeJs and Express that would ask for a username and email when registering. Currently, it only accepts username for login. I am using Passport and LocalStrategy. I want users to be able to provide either the username or email in the same input field, How can I do that? I have searched the internet and found similar questions, but I haven't been able to implement their answers successfully. Here are the relevant parts of my app.js

Below is some code I need to fix. I fixed some of the errors, but I cant get the 3 buttons to work. They are the random facts buttons, the colors orange pink and green button, and the grow and shrink button.

I posted the code below, the html seems right to me, and the css too. I am betting on the Javascript to be wrong for the buttons, but I just don't see what part of it could be incorrect. This is due to my inexperience but I am pretty sure I fixed all the HTML errors.

I have an ASPX Web Forms control that imports from another project the Person class.