fn main() {
    println!("Hello, testing for crates.io!");

    let ff = string_find_f("test for crates");
    println!("find it : {}", ff);

    let cf = choose_str(1);
    println!("cf = {}", cf);

}



// char_indices() works for Rust chars (UTF-8)
//    if don't specify lifetime Rust trys assumptions
//    fn string_find_f(s: &str) -> &str {

    fn string_find_f<'a>(s: &'a str) -> &'a str {

    for (n, x) in s.char_indices() {
        if x == 'f' {
            return &s[n..];
        }
    }
    s    // return value if 'f' not found
}

// lifetime example - return &str - don't know lifetime
fn choose_str(n: i32) -> &'static str {
    match n {
        0 => "hello",
        1 => "goodbye",
        _ => "other",
    }
}



// Changes to Cargo.toml to upload to crates.io
//    to change have to upload a new version
//     change version number to do that
/*
========================
[package]
name = "v1_hello_crates_demo_test_crate_do_not_use"
version = "0.1.0"
authors = ["david ellison <dellison47@gmail.com>"]
edition = "2018"

keywords = ["do", "not", "use"]
repository = xxxxxxxxxxxxxxx source repository
description = "Do not use this crate for demo only"
readme = "readme.md"
========

The repository field should be 
a URL to the source repository for 
your package.

repository = "https://github.com/rust-lang/cargo/"

*/