Why does my flutter code with the triple backticks look different from the others when they do it oneclass.

My question when people from oneclass sent me there answer with triple backticks the flutter code is formatted see screenshot below.

But mine using the triple backticks isn't formatted see screenshot below

Why is this not valid pubspec.yaml this was a default one created by flutter. Someone wrote this isn't valid pubspec.yaml from oneclass.

All I did was just add -

Flutter Program ver 3.7.6 and Android Studio Eel ver 2022.1.1 Patch 1

What implementation code to put under TodoListState trying to create

a todo list for flutter project. See screenshot below

Flutter Program ver 3.7.6 and Android Studio Eel ver 2022.1.1 Patch 1

Saw this Youtube program for a flutter todo list program.

Downloaded and ran it.

The pubspec.yaml ran pub get and I get this error msg see 2nd screenshot below the first screenshot. How to do symlink support.

On a Windows 10 OS and my developers option is set to on. See 1st screenshot.