number2name 1.1.1

Simple Rust library to convert an index to a name that is as short as possible.
Documentation 
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use ::number2name::Charset;
use ::number2name::BASE32;
use ::number2name::BASE32CROCKFORD;
use ::number2name::BASE32HEX;
use ::number2name::BASE32HUMAN;
use ::number2name::BASE32LOWERCASE;
use ::number2name::BASE32SCNY;
use ::number2name::BASE64;
use ::number2name::BASE64URL;
use ::number2name::HEX;
use ::number2name::HEXLOWERCASE;

pub fn charset_by_identifier(identifier: &str) -> Result<Charset, String> {
    Ok(match identifier.to_uppercase().as_str() {
        "HEX" => HEX.clone(),
        "HEXLOWERCASE" => HEXLOWERCASE.clone(),
        "BASE32" => BASE32.clone(),
        "BASE32LOWERCASE" => BASE32LOWERCASE.clone(),
        "BASE32HUMAN" => BASE32HUMAN.clone(),
        "BASE32CROCKFORD" => BASE32CROCKFORD.clone(),
        "BASE32SCNY" => BASE32SCNY.clone(),
        "BASE32HEX" => BASE32HEX.clone(),
        "BASE64" => BASE64.clone(),
        "BASE64URL" => BASE64URL.clone(),
        _ => {
            let mut literal = identifier;
            if literal.starts_with('\'') || literal.starts_with('"') {
                literal = &literal[1..literal.len() - 1]
            } else {
                eprintln!(
                    "Charset '{}' was not a built-in identifier and was not quoted; \
                it will be treated as a literal set of characters, but it is recommended that \
                you enclose it in quotes ('), so it is never interpreted as a name of a charset\
                (you may need \"'..'\" because the shell strips the outer quotes)",
                    &literal
                )
            }
            Charset::case_sensitive(literal)
        }
    })
}