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+// This is a quiz for the following sections:
+// - Strings
+// - Vecs
+// - Move semantics
+// - Modules
+// - Enums
+//
+// Let's build a little machine in the form of a function. As input, we're going
+// to give a list of strings and commands. These commands determine what action
+// is going to be applied to the string. It can either be:
+// - Uppercase the string
+// - Trim the string
+// - Append "bar" to the string a specified amount of times
+// The exact form of this will be:
+// - The input is going to be a Vector of a 2-length tuple,
+//   the first element is the string, the second one is the command.
+// - The output element is going to be a Vector of strings.
+
+pub enum Command {
+    Uppercase,
+    Trim,
+    Append(usize),
+}
+
+mod my_module {
+    use super::Command;
+
+    // TODO: Complete the function signature!
+    pub fn transformer(input: ???) -> ??? {
+        // TODO: Complete the output declaration!
+        let mut output: ??? = vec![];
+        for (string, command) in input.iter() {
+            // TODO: Complete the function body. You can do it!
+        }
+        output
+    }
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    // TODO: What do we need to import to have `transformer` in scope?
+    use ???;
+    use super::Command;
+
+    #[test]
+    fn it_works() {
+        let output = transformer(vec![
+            ("hello".into(), Command::Uppercase),
+            (" all roads lead to rome! ".into(), Command::Trim),
+            ("foo".into(), Command::Append(1)),
+            ("bar".into(), Command::Append(5)),
+        ]);
+        assert_eq!(output[0], "HELLO");
+        assert_eq!(output[1], "all roads lead to rome!");
+        assert_eq!(output[2], "foobar");
+        assert_eq!(output[3], "barbarbarbarbarbar");
+    }
+}