string1 solution

solutions/09_strings/strings1.rs

@@ -1 +1,9 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+fn current_favorite_color() -> String {
+    // Equivalent to `String::from("blue")`
+    "blue".to_string()
+}
+
+fn main() {
+    let answer = current_favorite_color();
+    println!("My current favorite color is {answer}");
+}