feat: move quiz2 to be strings4

exercises/strings/strings4.rs

@@ -0,0 +1,29 @@
+// strings4.rs
+
+// Ok, here are a bunch of values-- some are `String`s, some are `&str`s. Your
+// task is to call one of these two functions on each value depending on what
+// you think each value is. That is, add either `string_slice` or `string`
+// before the parentheses on each line. If you're right, it will compile!
+// No hints this time!
+
+// I AM NOT DONE
+
+fn string_slice(arg: &str) {
+    println!("{}", arg);
+}
+fn string(arg: String) {
+    println!("{}", arg);
+}
+
+fn main() {
+    ???("blue");
+    ???("red".to_string());
+    ???(String::from("hi"));
+    ???("rust is fun!".to_owned());
+    ???("nice weather".into());
+    ???(format!("Interpolation {}", "Station"));
+    ???(&String::from("abc")[0..1]);
+    ???("  hello there ".trim());
+    ???("Happy Monday!".to_string().replace("Mon", "Tues"));
+    ???("mY sHiFt KeY iS sTiCkY".to_lowercase());
+}

info.toml

@@ -167,7 +167,7 @@ For that first compiler error, it's important in Rust that each conditional
 block returns the same type! To get the tests passing, you will need a couple
 conditions checking different input values."""
 
-# TEST 1
+# QUIZ 1
 
 [[exercises]]
 name = "quiz1"
@@ -454,6 +454,12 @@ them!
 For the compose_me method: You can either use the `format!` macro, or convert the string
 slice into an owned string, which you can then freely extend."""
 
+[[exercises]]
+name = "strings4"
+path = "exercises/strings/strings4.rs"
+mode = "compile"
+hint = "No hints this time ;)"
+
 # MODULES
 
 [[exercises]]
@@ -517,8 +523,7 @@ Hint 2: If there is already an entry for a given key, the value returned by `ent
 Learn more at https://doc.rust-lang.org/book/ch08-03-hash-maps.html#updating-a-value-based-on-the-old-value
 """
 
-
+# QUIZ 2
-# TEST 2
 
 [[exercises]]
 name = "quiz2"