Rename functions.

functions.tf

@@ -93,7 +93,7 @@ output "timeout" {
 resource "aws_lambda_function" "function" {
   count             = length(local.functions)
   runtime           = var.runtime
-  function_name     = "${local.function_name_prefix}_${local.functions[count.index]}"
+  function_name     = "${local.function_name_prefix}-${replace(local.functions[count.index], "_", "")}"
   role              = local.lambda_role_arn
   source_code_hash  = filebase64sha256("payload.zip")
   s3_bucket         = local.payloads_bucket_name