Modified Code

variables.tf

@@ -1,34 +1,37 @@
 variable "name_prefix" {
-    description = "Creates a unique name beginning with the specified prefix."
+  description = "Creates a unique name beginning with the specified prefix."
+  default     = null
 }
 
 variable "description" {
-    description = "The security group description. Defaults to Managed by Terraform."
+  description = "The security group description. Defaults to Managed by Terraform"
+  default     = null
+}
+
+variable "ingress" {
+    description = "Ingress rules for security group"
+    type        = any
+    default     = []
+}
+
+variable "egress" {
+    description = "Egress rules for security group"
+    type        = any
+    default     = []
 }
 
 variable "revoke_rules_on_delete" {
-  description = "Instruct Terraform to revoke all of the Security Groups attached ingress and egress rules before deleting the rule itself."
+  description = "Instruct Terraform to revoke all of the Security Groups attached ingress and egress rules before deleting the rule itself"
   type        = bool
   default     = false
 }
 
 variable "vpc_id" {
-    description = "The VPC ID."
+    description = "The VPC ID"
 }
 
 variable "tags" {
     description = "A mapping of tags to assign to the resource."
     type        = map(string)
-}
-
-variable "ingress_rules" {
-    description = "Ingress rules for security group"
-    type        = any
-    default     = []
-}
-
-variable "egress_rules" {
-    description = "Egress rules for security group"
-    type        = any
-    default     = []
+    default     = {}
 }