Fix unterminated code block in README.md

[Copilot]

Closes: (issue number not provided)

The C code block starting at line 11 was terminated with only two backticks (``) instead of three (```), breaking markdown rendering.

Changes:

• Line 21: Added missing third backtick to properly close code block
• Line 22: Added blank line after closing fence for proper formatting

Introduced in commit 4674876.

Original prompt

Fix markdown syntax error in README.md where a code block has not been terminated correctly. This bug was introduced in commit 4674876.

On line 21, the C code block is not properly terminated - it only has two backticks (``) instead of three (```).

Changes needed:

1. Line 21: Change `` to ``` (add the missing third backtick to properly close the C code block that starts on line 11)
2. Add an empty line after the closing backticks for better formatting

This will fix the markdown rendering issue.

This pull request was created as a result of the following prompt from Copilot chat.

Fix markdown syntax error in README.md where a code block has not been terminated correctly. This bug was introduced in commit 4674876.

On line 21, the C code block is not properly terminated - it only has two backticks (``) instead of three (```).

Changes needed:

1. Line 21: Change `` to ``` (add the missing third backtick to properly close the C code block that starts on line 11)
2. Add an empty line after the closing backticks for better formatting

This will fix the markdown rendering issue.

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