Fix codestyle violation

Author: wendelinwemhoener

build.gradle

@@ -41,7 +41,7 @@ checkstyle {
     toolVersion = '10.2'
 }
 
-run{
+run {
     standardInput = System.in
     enableAssertions = true
 }

src/main/java/seedu/duke/flashcard/FlashcardStorage.java

@@ -85,7 +85,9 @@ public FlashcardList loadFlashcards() throws FileNotFoundException{
             flashcardList.add(loadFlashcard(flashTokens));
         }
 
-        System.out.println(String.format("    There are currently %d flashcards in the savefile", flashcardList.getSize()));
+        System.out.println(String.format(
+                "    There are currently %d flashcards in the savefile",
+                flashcardList.getSize()));
 
         return flashcardList;