Modify main.py to handle more cases from ChatGPT

Author: code-yeongyu

aishell/main.py

@@ -15,6 +15,10 @@ def make_executable_command(command: str) -> str:
         command = command[1:]
     if command.endswith('\n'):
         command = command[:-1]
+    if command.startswith('`'):
+        command = command[1:]
+    if command.endswith('`'):
+        command = command[:-1]
     command = command.strip()
     command = command.split('User: ')[0]
     return command