bug: Extra blank space in output

[gaocegege]

{"id":"86b6656b-bc89-4e75-9090-5dbe51b61b7f","object":"chat","created":"2023-05-31T11:50:37.807943","model":"lmsys/fastchat-t5-3b-v1.0","usage":{"prompt_tokens":86,"completion_tokens":105,"total_tokens":191},"choices":[{"message":{"content":"I  like  English  because  it  is  my  mother  tongue.\n","role":"assistant","name":""},"index":0,"finish_reason":"stop"}]}