b64-degarbage.rs

let bytes = input.as_bytes();
let mut raw = Vec::<u8>::with_capacity(input.len());

for (offset, codepoint) in input.char_indices() {
    let c = codepoint as u32;

    if (c > 0x40 && c < 0x5b) || (c > 0x60 && c < 0x7b) ||
    (c > 0x29 && c < 0x3a) || c == 0x2b || c == 0x2f {
        raw.push(bytes[offset]);
    } else if codepoint.is_whitespace() || c == 0x3d {
        ;
    } else {
        panic!("change this to error when I add return type");
    }
}