intro and variables

exercises/00_intro/intro1.rs

@@ -6,6 +6,7 @@
 // Try adding a new `println!` and check the updated output in the terminal.
 
 fn main() {
+    println!("hello world!\n");
     println!(r#"       Welcome to...                      "#);
     println!(r#"                 _   _ _                  "#);
     println!(r#"  _ __ _   _ ___| |_| (_)_ __   __ _ ___  "#);

exercises/00_intro/intro2.rs

@@ -1,4 +1,4 @@
 fn main() {
     // TODO: Fix the code to print "Hello world!".
-    printline!("Hello world!");
+    println!("Hello world!");
 }