FileManager completed.

src/main/java/dev/utils/FileManager.java

@@ -17,11 +17,9 @@ public class FileManager {
         String line;
 
         while ((line = reader.readLine()) != null) {
-
-            // TODO:
-
-            // Add line to list
-
+            if (!line.trim().isEmpty()) {
+                lines.add(line);
+            }
         }
 
         reader.close();