rework prompts

src/gaia_solving_agent/utils.py

@@ -1,7 +1,10 @@
 import re
 
 
-def extract_pattern(pattern: str, text: str) -> str:
-    search = re.search(pattern, text)
-    extracted = search.group(1) if search else ""
-    return extracted
+def extract_pattern(pattern: str, text: str) -> str | None:
+    matches = re.findall(pattern, text)
+    if matches:
+        extracted = matches[-1]
+        return extracted
+    else:
+        return None