use crate::error::Error;use crate::error::Result;pub fn parse_sed_command(sed_command: &str) -> Result<()> {    // For now, we parse only commands like `122,202p`.    if let Some(stripped) = sed_command.strip_suffix("p")        && let Some((first, rest)) = stripped.split_once(",")        && first.parse::<u64>().is_ok()        && rest.parse::<u64>().is_ok()    {        return Ok(());    }    Err(Error::SedCommandNotProvablySafe {        command: sed_command.to_string(),    })}