refactor(C99Source): optimize subdomain extraction logic to break early when subdomains are found

Author: ayanrajpoot10

bugscanx/modules/scrapers/subfinder/sources.py

@@ -115,6 +115,8 @@ def fetch(self, domain):
                     text = link.get_text(strip=True)
                     if text.endswith(f".{domain}"):
                         subdomains.add(text)
+                if subdomains:
+                    break
         return subdomains