compare two strings ignoring case

compare_ci.rs

fn compare_ci(x: &str, y: &str) -> bool {
  if x.char_len() != y.char_len() {
    return false;
  }

  let mut it = x.chars().zip(y.chars());
  it.all(|(x,y)|
    unsafe {
      x.to_ascii_nocheck().to_lower() == y.to_ascii_nocheck().to_lower()
    }
  )
}

#[test]
fn test_compare_case_insensitive(){
  let x = ~"Bilbo Bąggins";
  let y = ~"bILbo bąGgins";

  assert_eq!(compare_ci(x, y), true);
}

#[test]
fn test_compare_case_diff_length(){
  let x = ~"Bilbo Bąggin";
  let y = ~"bILbo bąGgins";

  assert_eq!(compare_ci(x, y), false);
}