fix some typos (#1540) · krahets/hello-algo@57cf6b1

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

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

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

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

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

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

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

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

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