formatting

local.tf

@@ -5,7 +5,21 @@ locals {
         # note: construct lambda arn before to prevent dependency cycles, i.e.
             # notification_policy(lambda) -> lambda(sns) -> sns(notification_policy)
             #  -> ad infinitum.
-    function_name_format_short      = replace(replace(var.lambda.function_name, "/", "-"), var.namespace, "")
+    function_name_format_short      = trimsuffix(
+                                        trimprefix(
+                                            replace(
+                                                replace(
+                                                    var.lambda.function_name, 
+                                                    "/", 
+                                                    "-"
+                                                ), 
+                                                var.namespace, 
+                                                ""
+                                            ),
+                                            "_"
+                                        ),
+                                        "_"
+                                    )
     lambda_arn                      = "arn:aws:lambda:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:function:${var.lambda.function_name}:*"
 
     # Calculations