use serde_derive::{Serialize, Deserialize}; // 1.0.94

#[derive(Deserialize, Serialize, Debug)]
pub struct CourseResult {
    pub key: String,
}

#[derive(Deserialize, Serialize, Debug)]
pub struct ApprendoObject {
    pub item: String,
}

pub fn mapper<'a, I>(src: I) // -> impl Iterator<Item = ApprendoObject>
where
    I: Iterator<Item = &'a CourseResult>,
{
    // let mut objects: Vec<ApprendoObject> = vec![];

    src.map(|c| {
        println!("OK");
    });

}

fn main() {
    println!("hello");

}