You can do it like this:
fn base_10_bytes(mut n: u64, buf: &mut [u8]) -> &[u8] {
if n == 0 {
return b"0";
}
let mut i = 0;
while n > 0 {
buf[i] = (n % 10) as u8 + b'0';
n /= 10;
i += 1;
}
let slice = &mut buf[..i];
slice.reverse();
&*slice
}
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