fix: ✏️ typos and compiler warnings

05-functions/src/main.rs

@@ -1,26 +1,22 @@
-fn main() 
-    {
-        hello();
+fn main() {
+    hello();
 
-        let x = {
-            let y = 5; //Statement
-            y+0 //Expression
-        };
-        println!("X = {}", x);
+    let x = {
+        let y = 5; //Statement
+        y + 0 //Expression
+    };
+    println!("X = {}", x);
 
+    let y = return_value(x);
+    println!("Y = {}", y)
+}
 
-        let y = return_value(x);
-        println!("Y = {}", y)
-    }
+fn hello() {
+    println!("Hello World");
+}
 
-fn hello()
-    {
-        println!("Hello World");
-    }
-
-fn return_value(mut x:i32) -> i32
-    {
-        println!("We're going to return something");
-        x = x+1;
-        x*x
-    }
+fn return_value(mut x: i32) -> i32 {
+    println!("We're going to return something");
+    x = x + 1;
+    x * x
+}