Add traits solutions

exercises/traits/traits1.rs

@@ -8,14 +8,17 @@
 // which appends "Bar" to any object
 // implementing this trait.
 
-// I AM NOT DONE
-
 trait AppendBar {
     fn append_bar(self) -> Self;
 }
 
 impl AppendBar for String {
-    //Add your code here
+    fn append_bar(self) -> Self {
+        // self.push_str("Bar");
+        // self
+        // OR
+        format!("{}Bar", self)
+    }
 }
 
 fn main() {

exercises/traits/traits2.rs

@@ -10,13 +10,17 @@
 // No boiler plate code this time,
 // you can do this!
 
-// I AM NOT DONE
-
 trait AppendBar {
     fn append_bar(self) -> Self;
 }
 
 //TODO: Add your code here
+impl AppendBar for Vec<String> {
+    fn append_bar(mut self) -> Self {
+        self.push(String::from("Bar"));
+        self
+    }
+}
 
 #[cfg(test)]
 mod tests {