g60 0.3.2

encodes and decodes G60 as bytes or utf8
Documentation 
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// Maps a G60 value (0..59) to its ASCII character in the encoded string.
pub(crate) const G60_TO_CHAR: &[u8; 60] =
    b"0123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

// Maps an ASCII character to its G60 value (0..59). 255 means invalid.
// Sized to 256 so any byte value can be indexed directly without a bounds check.
pub(crate) const CHAR_TO_G60: &[u8; 256] = &[
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 255, 255,
    255, 255, 255, 255, 10, 11, 12, 13, 14, 15, 16, 17, 255, 18, 19, 20, 21, 22, 255, 23, 24, 25,
    26, 27, 28, 29, 30, 31, 32, 33, 255, 255, 255, 255, 255, 255, 34, 35, 36, 37, 38, 39, 40, 41,
    42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
    // 123..=255 are all invalid
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
];

// ----------------------------------------------------------------------------
// TESTS ----------------------------------------------------------------------
// ----------------------------------------------------------------------------

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_reverse_mapping() {
        for (index, c) in G60_TO_CHAR.iter().enumerate() {
            let value = CHAR_TO_G60[*c as usize];

            assert_eq!(index, value as usize, "Incorrect for {}", c)
        }
    }
}