You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: exponent.rs
    path of file: ./repos/phaser/phaser/vendor/ryu/src/pretty
    
    the code of the file until where you have to start completion: use crate::digit_table::*;
use core::ptr;

#[cfg_attr(feature = "no-panic", inline)]
pub unsafe fn write_exponent3(mut k: isize, mut result: *mut u8) -> usize {
    let sign = k < 0;
    if sign {
        *result = b'-';
        result = result.offset(1);
        k = -k;
    }

    debug_assert!(k < 1000);
    if k >= 100 {
        *result = b'0' + (k / 100) as u8;
        k %= 100;
    
pub unsafe fn write_exponent2(mut k: isize, mut result: *mut u8) -> usize {
    let sign = k < 0;
    if sign {
        *result = b'-';
        result = result.offset(1);
        k = -k;
    }

    debug_assert!(k < 100);
    if k >= 10 {
        let d = DIGIT_TABLE.get_unchecked(k as usize * 2);
        ptr::copy_nonoverlapping(d, result, 2);
        sign as usize + 2
    } else {
        *result = b'0' + k as u8;
        sign as usize + 1
    }
}