Add solutions for sheet6

aufgaben/sheet6/sol3/swagger.rs

@@ -0,0 +1,27 @@
+use std::fmt;
+
+struct Swagger<T>(pub T);
+
+impl<T: fmt::Display> fmt::Display for Swagger<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        write!(f, "yolo {} swag", self.0)
+    }
+}
+
+trait SwaggerExt: Sized {
+    fn with_swag(self) -> Swagger<Self>;
+}
+
+impl<T> SwaggerExt for T {
+    fn with_swag(self) -> Swagger<Self> {
+        Swagger(self)
+    }
+}
+
+fn main() {
+    let pi = 3.14;
+
+    println!("{}", pi);
+    println!("{}", Swagger(pi));
+    println!("{}", pi.with_swag());
+}