BBP 0.0.0

Calculate π using the extended BBP formula
Documentation 
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use super::*;
use crate::helpers::HexViewer8;

impl Display for PiViewerBase256 {
    fn fmt(&self, f: &mut Formatter) -> core::fmt::Result {
        let max_length = (self.start + self.buffer.len() as u64).to_string().len();

        for (i, chunk) in self.buffer.chunks(10).enumerate() {
            let position = self.start as usize + i * 10;
            write!(f, "{}", position)?;
            for _ in 0..(max_length - position.to_string().len()) {
                write!(f, " ")?;
            }
            write!(f, "│ ")?;

            for base16 in chunk.iter() {
                write!(f, "{:>3}", base16)?;
                write!(f, " ")?
            }
            writeln!(f)?;
        }
        Ok(())
    }
}

impl UpperHex for PiViewerBase256 {
    fn fmt(&self, f: &mut Formatter) -> core::fmt::Result {
        Display::fmt(&HexViewer8 { lower: false, start: self.start, buffer: &self.buffer }, f)
    }
}

impl LowerHex for PiViewerBase256 {
    fn fmt(&self, f: &mut Formatter) -> core::fmt::Result {
        Display::fmt(&HexViewer8 { lower: true, start: self.start, buffer: &self.buffer }, f)
    }
}