diff --git a/main.py b/main.py
index 66e6f82..8412c58 100644
--- a/main.py
+++ b/main.py
@@ -86,6 +86,37 @@ class:
     prompt = f"{intstructions} {indications} The subject of the presentation is: {subject} The Language is: {language} <|endofprompt|> \n {marp}"    
     subject2 = subject
     subject = subject.replace(" ", "-")
+    #also replae all forbidden characters
+    subject = subject.replace("/", "-")
+    subject = subject.replace("?", "-")
+    subject = subject.replace("!", "-")
+    subject = subject.replace(":", "-")
+    subject = subject.replace(";", "-")
+    subject = subject.replace("(", "-")
+    subject = subject.replace(")", "-")
+    subject = subject.replace("[", "-")
+    subject = subject.replace("]", "-")
+    subject = subject.replace("{", "-")
+    subject = subject.replace("}", "-")
+    subject = subject.replace("'", "-")
+    subject = subject.replace('"', "-")
+    subject = subject.replace("=", "-")
+    subject = subject.replace("+", "-")
+    subject = subject.replace("*", "-")
+    subject = subject.replace("&", "-")
+    subject = subject.replace("^", "-")
+    subject = subject.replace("%", "-")
+    subject = subject.replace("$", "-")
+    subject = subject.replace("#", "-")
+    subject = subject.replace("@", "-")
+    subject = subject.replace("`", "-")
+    subject = subject.replace("~", "-")
+    subject = subject.replace("|", "-")
+    subject = subject.replace("<", "-")
+    subject = subject.replace(">", "-")
+    subject = subject.replace(",", "-")
+    subject = subject.replace(".", "-")
+    subject = subject.replace("?", "-")
     #we save teh subject in base64 in a variable
     b64 = base64.urlsafe_b64encode(subject.encode("utf-8"))
     #if dosen't exist, create a directory called "userid" where the userid is the id of the user who called the command