pub fn pascal_to_title(s: &str) -> String
{
    let mut out = String::new();

    for (i, ch) in s.chars().enumerate() {
        if ch.is_uppercase() && i > 0 { out.push(' '); }
        out.push(ch);
    }

    out
}

pub fn snake_to_title(s: &str) -> String
{
    s.split('_')
        .map(|word| {
            let mut c = word.chars();
            match c.next() {
                None    => String::new(),
                Some(f) => f.to_uppercase().collect::<String>() + c.as_str(),
            }
        })
        .collect::<Vec<_>>()
        .join(" ")
}

pub fn pascal_to_snake(s: &str) -> String
{
    let mut out = String::with_capacity(s.len());
    let mut prev_lower = false;

    for c in s.chars()
    {
        if c.is_uppercase()
        {
            if prev_lower              { out.push('_'); }
            for lc in c.to_lowercase() { out.push(lc); }
            prev_lower = false;
        }
        else
        {
            prev_lower = true;
            out.push(c);
        }
    }

    out
}