use serde::{Deserialize, Serialize};
use std::string::ToString;

#[derive(Debug, Serialize, Deserialize)]
#[serde(rename_all = "kebab-case")]
enum Action {
    OptIn,
    OptOut,
}

impl ToString for Action {
    fn to_string(&self) -> String {
        serde_json::to_string(&self).unwrap()
    }
}

fn main() {
    let opt_in = Action::OptIn;
    let out = Action::OptOut;

    println!("Hello, world!, {}, {}", opt_in.to_string(), out.to_string());
}