How to not rewrite it in Rust(adventures.michaelfbryan.com)

  use sha2::{Sha256, Digest};
  use base64;
  
  fn main() {
      let mut hasher = Sha256::new();
      hasher.input(b"hello world");
      let result = hasher.result();
      let encoded = base64::encode(&result);
    
      assert_eq!("uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=", encoded);
  }

    let my_rust_string = str::from_utf8(result).unwarp() 

    let my_rust_string = match str::from_utf8(result) {
        Ok(str) => str,
        Err(err) => panic!("Invalid utf8: {}", err),
    };
 

    let my_rust_string = String::from_utf8_lossy(result);