Update app.py

app.py

@@ -32,7 +32,7 @@ def to_html(document):
 
 
 def upload_file(file, paper_type):
-    command = f"python3 aclpubcheck-main/aclpubcheck/formatchecker.py --paper_type {paper_type} {file.name.replace(" ", "\ ")}"
+    command = f"python3 aclpubcheck-main/aclpubcheck/formatchecker.py --paper_type {paper_type} {file.name.replace(' ', '\ ')}"
     out = subprocess.run(command, shell=True, stdout=subprocess.PIPE, text=True, stderr=subprocess.STDOUT)
     return to_html(remove_color_codes(out.stdout))