chore: refactor proxy gathering into dedicated function

main.py

@@ -29,10 +29,7 @@ def write_file(path, data):
         file.write(data)
 
 
-def main():
-    """Main entry point."""
-    logging.basicConfig(level=logging.WARN)
-
+def gather_proxies():
     # Load proxy source list and fetch proxies
     urls = read_file('data/proxy-sources.txt')
     proxies = fetch_all(urls)
@@ -95,5 +92,11 @@ def main():
     )
 
 
+def main():
+    """Main entry point."""
+    logging.basicConfig(level=logging.WARN)
+    gather_proxies()
+
+
 if __name__ == '__main__':
     main()