remove create_func....

core/problem.py

@@ -0,0 +1,15 @@
+from typing import Callable
+from config import ProblemConfig
+from state import State
+
+
+class Problem:
+
+    def __init__(self, config: ProblemConfig):
+        raise NotImplementedError
+
+    def setup(self, state=State()):
+        raise NotImplementedError
+
+    def evaluate(self, state: State, act_func: Callable, params):
+        raise NotImplementedError