first_lifetime_fix.rs

struct SomeCollection<'a> {
    strings: Vec<&'a str>
}

impl<'a> SomeCollection<'a> {
    pub fn new() -> Self {
        SomeCollection { strings: Vec::new() }
    }
    
    pub fn insert(&mut self, s: &'a str) {
        self.strings.push(s);
    }
    
    pub fn print_all(&self) {
        self.strings.iter().for_each(|item| println!("{}", item));
    }
}

fn main() {
    let mut values : Vec<String> = Vec::new();
    let mut my_collection = SomeCollection::new();

    (0..10).for_each( |item| {
        let value = format!("value number {}", item + 1);
        values.push(value);
    });
    
    values.iter().for_each(|value| my_collection.insert(&value));
    my_collection.print_all();
}