Introduce remove_credentials to remove code duplication

freqtrade/configuration/check_exchange.py

@@ -10,6 +10,19 @@ from freqtrade.state import RunMode
 logger = logging.getLogger(__name__)
 
 
+def remove_credentials(config: Dict[str, Any]):
+    """
+    Removes exchange keys from the configuration and specifies dry-run
+    Used for backtesting / hyperopt / edge and utils.
+    Modifies the input dict!
+    """
+    config['exchange']['key'] = ''
+    config['exchange']['secret'] = ''
+    config['exchange']['password'] = ''
+    config['exchange']['uid'] = ''
+    config['dry_run'] = True
+
+
 def check_exchange(config: Dict[str, Any], check_for_bad: bool = True) -> bool:
     """
     Check if the exchange name in the config file is supported by Freqtrade