Function extract_markdown_block_with_lang 

pub fn extract_markdown_block_with_lang(
    text: &str,
    lang: &str,
) -> Result<String, ParseError>

Extracts content from a Markdown code block with a specific language.

This function searches for a code block with the specified language hint (e.g., rust, python) and returns its content.

Arguments

• text - The text containing the markdown code block
• lang - The language specifier to match (e.g., “rust”, “python”)

Returns

A Result containing the extracted code block content on success, or a ParseError if no code block with the specified language is found.