A query string builder for percent encoding key-value pairs

This is a tiny helper crate for simplifying the construction of URL query strings. The initial ? question mark is automatically prepended.

Example

use query_string_builder::QueryString;

fn main() {
    let qs = QueryString::new()
        .with_value("q", "apple")
        .with_opt_value("color", None::<String>)
        .with_opt_value("category", Some("fruits and vegetables?"));

    assert_eq!(
        format!("https://example.com/{qs}"),
        "https://example.com/?q=apple&category=fruits%20and%20vegetables?"
    );
}