style: :art: fix checkstyle

edu_assistant/learning_tasks/coding_problem.py

@@ -61,7 +61,8 @@ class CodingProblem(Model):
     def expr(self, lang=""):
         expr = f"## Question\n\n```\n{escape_for_prompt(self.question)}\n```\n\n"
         expr += (
-            f"## Standard Answer (There might be others)\n\n```{lang}\n{escape_for_prompt(self.standard_answer)}\n```\n\n"
+            f"""## Standard Answer (There might be others)\n\n```{lang}\n{escape_for_prompt(self.standard_answer)}\n```
+"""
             if self.standard_answer
             else ""
         )