#[inline]
fn is_valid(arg: &String) -> bool {
    static SCREENED_KEYWORDS: [&'static str; 4] = ["back to reddit", "8chan", "bit.ly", "goo.gl"];
    for word in arg.split_ascii_whitespace() {
        for keyword in SCREENED_KEYWORDS.iter() {
            if word.contains(keyword) {
                return false;
            }
        }
        for c in arg.chars() {
            // filter lenny
            // filter barille
            match c {
                '\u{2800}'..='\u{28FF}' | 'ʖ' => {
                    return false;
                }
                _ => {}
            }
        }
    }
    true
}

fn sanitize(arg: &String) -> Option<String> {
    if is_valid(&arg) {
        return None;
    }
    let mut result = String::with_capacity(arg.len());

    // Trim leading whitespace
    // Trim trailing newlines
    // Trim unicodes (>= U+0370)
    for line in arg.split('\n') {
        for word in line.split_ascii_whitespace() {
            for character in word.chars() {
                match character {
                    '\u{0000}' ..= '\u{0370}' => {result.push(character);},
                    _ => {}
                }
            }
        }
    }

    return Some(result);
}