Fix bugs and harmonize the code comments · krahets/hello-algo@a7d3eab

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Build: codes/csharp/chapter_tree/avl_tree.cs#L38

Dereference of a possibly null reference.

Build: codes/csharp/chapter_tree/avl_tree.cs#L39

Dereference of a possibly null reference.

Build: codes/csharp/chapter_tree/avl_tree.cs#L52

Dereference of a possibly null reference.

Build: codes/csharp/chapter_tree/avl_tree.cs#L53

Dereference of a possibly null reference.

Build: codes/csharp/chapter_computational_complexity/space_complexity.cs#L25

The variable 'c' is assigned but its value is never used

Build: codes/csharp/chapter_computational_complexity/space_complexity.cs#L19

The variable 'a' is assigned but its value is never used

Build: codes/csharp/chapter_computational_complexity/space_complexity.cs#L20

The variable 'b' is assigned but its value is never used

Build: codes/csharp/chapter_tree/avl_tree.cs#L38

Dereference of a possibly null reference.

Build: codes/csharp/chapter_tree/avl_tree.cs#L39

Dereference of a possibly null reference.

Build: codes/csharp/chapter_tree/avl_tree.cs#L52

Dereference of a possibly null reference.

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