A no_std, no allocation, core::fmt::Writeable buffer.
Usage:
use e_write_buffer::WriteBuffer;
use std::fmt::Write as _;
fn main() {
let mut buffer: WriteBuffer<20> = WriteBuffer::new();
let x = 12;
write!(buffer, "{}", x).unwrap();
assert_eq!(buffer.as_str(), "12");
}See also heapless::String as an alternative.