Function process_file_lines 

pub fn process_file_lines<F>(
    file_name: &str,
    f: F,
) -> Result<(), Box<dyn Error>>
where
    F: FnMut(&str),

Processes each line of a file with a given function.

Arguments

• file_name - The path to the file to process.
• f - A function to apply to each line of the file.

Returns

A Result indicating success or an error if the file could not be read.