Update graph_builder.py

graph_builder.py

@@ -0,0 +1,25 @@
+from langgraph.graph import Graph
+from llm_node import llm_node
+from formatter_node import formatter_node
+
+def build_graph():
+    graph = Graph()
+
+    def llm_step(state):
+        question = state["question"]
+        result = llm_node().run(question)
+        state["llm_output"] = result
+        return state
+
+    def formatter_step(state):
+        cleaned = formatter_node(state["llm_output"])
+        state["final_answer"] = cleaned
+        return state
+
+    graph.add_node("llm", llm_step)
+    graph.add_node("formatter", formatter_step)
+    graph.set_entry_point("llm")
+    graph.add_edge("llm", "formatter")
+    graph.set_finish_point("formatter")
+
+    return graph