start 04 traits, completed upto 10

exercises/04_traits/06_str_slice/src/lib.rs

@@ -31,16 +31,16 @@ impl Ticket {
         }
     }
 
-    pub fn title(&self) -> &String {
-        &self.title
+    pub fn title(&self) -> &str {
+        &self.title.as_str()
     }
 
-    pub fn description(&self) -> &String {
-        &self.description
+    pub fn description(&self) -> &str {
+        &self.description.as_str()
     }
 
-    pub fn status(&self) -> &String {
-        &self.status
+    pub fn status(&self) -> &str {
+        &self.status.as_str()
     }
 }