Completed exercise up to Traits

exercises/12_options/options1.rs

@@ -3,7 +3,22 @@
 // someone eats it all, so no ice cream is left (value 0). Return `None` if
 // `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 > 23 {
+        None
+    } else if hour_of_day < 22 {
+            Some(5)
+        } else {
+            Some(0)
+        }
+
+    // OR
+    // fn maybe_ice_cream(hour_of_day: u16) -> Option<u16> {
+    //     match hour_of_day {
+    //         0..=21 => Some(5),
+    //         22 | 23 => Some(0),
+    //         _ => None,
+    //     }
+    // }    
 }
 
 fn main() {
@@ -20,7 +35,7 @@ mod tests {
         // Option?
         let ice_creams = maybe_ice_cream(12);
 
-        assert_eq!(ice_creams, 5); // Don't change this line.
+        assert_eq!(ice_creams, Some(5)); // Don't change this line.
     }
 
     #[test]