feat(options): completed options

exercises/12_options/options1.rs

@@ -4,6 +4,14 @@
 // `hour_of_day` is higher than 23.
 fn maybe_ice_cream(hour_of_day: u16) -> Option<u16> {
     // TODO: Complete the function body.
+
+    if hour_of_day < 22 {
+        Some(5)
+    } else if hour_of_day <= 23 {
+        Some(0)
+    } else {
+        None
+    }
 }
 
 fn main() {
@@ -18,7 +26,7 @@ mod tests {
     fn raw_value() {
         // TODO: Fix this test. How do you get the value contained in the
         // Option?
-        let ice_creams = maybe_ice_cream(12);
+        let ice_creams = maybe_ice_cream(12).unwrap();
 
         assert_eq!(ice_creams, 5); // Don't change this line.
     }