Change terminal bell to function api

src/terminal.rs

@@ -161,14 +161,8 @@ pub fn window_size() -> io::Result<WindowSize> {
 /// Typically this is a bell sound, but may also be a visual alert such as a screen flash.
 ///
 /// See [Wikipedia](https://en.wikipedia.org/wiki/Bell_character).
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct Bell;
-
-impl fmt::Display for Bell {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        use fmt::Write;
-        f.write_char(0x07 as char)
-    }
+pub fn bell() {
+    print!("{}", 0x07 as char);
 }
 
 /// Disables line wrapping.