added gewt_default_file_name() and wrote tests

refit/src/modules/librefit.py

@@ -33,3 +33,27 @@ def get_standard_folder_name(name):
             logger.debug("Continuing with expected input")
     logger.debug("get_standard_folder_name() exit.")
     return standard_folder_name
+
+def get_standard_file_name(name):
+    """Returns the default file name if none is provided."""
+    
+    logger.debug("running get_standard_file_name()")
+    
+    if name is None:
+        logger.warning("No name assigned, continue with default")
+        standard_file_name = "file"
+    else:
+        
+        if len(name) > 1:
+            _NAMES_WARNING = f"{len(name)} names given, only one required.\nContinuing with '{name[0]}' as name."
+            logger.warning(_NAMES_WARNING)
+            print(_NAMES_WARNING)
+            standard_file_name = name[0]
+
+            logger.debug(f"{standard_file_name}, Type: {type(standard_file_name)}")
+        else:
+            standard_file_name = name[0]
+            logger.debug("Continuing with expected input")
+    
+    logger.debug("exiting get_standard_file_name()")
+    return standard_file_name