diff --git a/gui/gui.py b/gui/gui.py
index ce55cef..6a99f55 100644
--- a/gui/gui.py
+++ b/gui/gui.py
@@ -1,4 +1,4 @@
-from gui.utils import nassi
+from gui.utils import nassi, output
 import PySimpleGUI as sg
 import os.path
 
@@ -59,17 +59,7 @@ def gui():
             break
 
         if event == '-OUTPUT FOLDER-':
-            output_path = values['-OUTPUT FOLDER-']
-            try:
-                file_list = os.listdir(output_path)
-            except:
-                file_list = []
-            fnames = [
-                f
-                for f in file_list
-                if os.path.isfile(os.path.join(output_path, f))
-                and f.lower().endswith(('.png', '.gif'))
-            ]
+            fnames = output(values)
             window['-OUTPUT FILE LIST-'].update(fnames)
         elif event == '-OUTPUT FILE LIST-':
             try:
@@ -96,18 +86,9 @@ def gui():
                     except:
                         pass
                     output_path = values['-OUTPUT FOLDER-']
-                    nassi(file_path, str(output_path))
-                    try:
-                        file_list = os.listdir(output_path)
-                    except:
-                        file_list = []
-                    fnames = [
-                        f
-                        for f in file_list
-                        if os.path.isfile(os.path.join(output_path, f))
-                        and f.lower().endswith(('.png', '.gif'))
-                    ]
+                    nassi(file_path, output_path)
                     
+                    fnames = output(values)
                     window['-OUTPUT FILE LIST-'].update(fnames)
 
                 elif values['-JAVA FOLDER-']:
diff --git a/gui/utils.py b/gui/utils.py
index ec46f27..14e9c8c 100644
--- a/gui/utils.py
+++ b/gui/utils.py
@@ -1,3 +1,5 @@
+import os
+
 from interpreter.NassiShneidermann import NassiShneidermanDiagram
 from draw.Iinstruction import *
 
@@ -7,6 +9,20 @@ def nassi(filepath:str, output_path: str):
     NSD.load_from_file(filepath)
     NSD.convert_to_image(output_path + "/Nassi-Shneider-Diagramm", 500)
 
+def output(values):
+    output_path = values['-OUTPUT FOLDER-']
+    try:
+        file_list = os.listdir(output_path)
+    except:
+        file_list = []
+    fnames = [
+        f
+        for f in file_list
+        if os.path.isfile(os.path.join(output_path, f))
+        and f.lower().endswith(('.png', '.gif'))
+    ]
+    return fnames
+
 if __name__ == "__main__":
     """Debugging"""
     nassi("res/input/input.java", "res/output")
\ No newline at end of file