refactor: use scalafmt to format code

src/main/wacc/Main.scala

@@ -3,13 +3,14 @@ package wacc
 import parsley.{Success, Failure}
 
 def main(args: Array[String]): Unit = {
-    println("hello WACC!")
+  println("hello WACC!")
 
-    args.headOption match {
-        case Some(expr) => parser.parse(expr) match {
-            case Success(x) => println(s"$expr = $x")
-            case Failure(msg) => println(msg)
-        }
-        case None => println("please enter an expression")
-    }
+  args.headOption match {
+    case Some(expr) =>
+      parser.parse(expr) match {
+        case Success(x)   => println(s"$expr = $x")
+        case Failure(msg) => println(msg)
+      }
+    case None => println("please enter an expression")
+  }
 }