Function parse_force_section 

pub fn parse_force_section<'a, I>(
    lines: &mut Peekable<I>,
    header: &FrameHeader,
    atom_data: &mut [AtomDatum],
) -> Result<bool, ParseError>
where
    I: Iterator<Item = &'a str>,

Attempts to parse a force section following coordinate (and optional velocity) blocks.

Force sections mirror velocity sections: a blank separator line followed by per-component force blocks (symbol line, “Forces of Component N” line, then atom lines with fx fy fz fixed_flag atom_id).

Returns Ok(true) if forces were found and parsed, Ok(false) otherwise.