/// (String) Converts first character of the input string to upper case and the remaining characters to lower case.
///
/// # Example
///
/// ```rust
/// use lodust::capitalize;
///
/// let capitalized = capitalize("Foo Bar".to_string());
/// // => "Foo bar"
///
/// let capitalized = capitalize("--foo--bar--".to_string());
/// // => "--foo--bar--"
///
/// let capitalized = capitalize("__FOO_BAR__".to_string());
/// // => "__foo_bar__"
/// ```
///