rustlings vec primitive types

exercises/01_variables/variables5.rs

@@ -0,0 +1,8 @@
+fn main() {
+    let number = "T-H-R-E-E"; // Don't change this line
+    println!("Spell a number: {number}");
+
+    // TODO: Fix the compiler error by changing the line below without renaming the variable.
+    let number = &3.to_string();
+    println!("Number plus two is: {}", number.to_owned() + &2.to_string());
+}