odins_mine.rs

use sha2::{Digest, Sha256};
use std::fmt::Write;
fn main() {
    println!("Answer is {:?}", rust_mine("hello"));
}
pub fn rust_mine(text: &str) -> String {
    let mut hasher = Sha256::new();
    let mut text = text.to_string();
    (0..std::usize::MAX)
        .find_map(|nonce| {
            text.split_off(5);
            write!(&mut text, "{}", nonce).unwrap();
            hasher.input(&text);
            let result = hasher.result_reset();
            if &result[0..2] == &[0, 0] && result[2] >> 4 == 0 {
                Some(format!("{:x}", result))
            } else {
                None
            }
        })
        .expect("unable to find answer")
}
#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn it_works() {
        assert_eq!(
            rust_mine("hello"),
            "0000037660ee0e22df67a053537e000325bbfad2cce9b8b7c795f6aa961d5cb7".to_string()
        );
    }
}