Close scanner after use

src/FileManager.java

@@ -22,7 +22,9 @@ public class FileManager {
         } else {
             Scanner fileReader = new Scanner(newFile);
             // using the delimiter \\Z reads the entire file at once
-            return fileReader.useDelimiter("\\Z").next();
+            String returnString = fileReader.useDelimiter("\\Z").next();
+            fileReader.close();
+            return returnString;
         }
     }