Solution

modules/resource_group_storage/.gitignore

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+**/.terraform/*
+./terraform/*
+*.tfstate
+*.tfstate.*
+*.zip
+

modules/resource_group_storage/main.tf

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+provider "azurerm" {
+  features {}
+}
+
+resource "azurerm_resource_group" "example" {
+  name     = var.resource_group_name
+  location = var.location
+}
+
+resource "azurerm_storage_account" "example" {
+  name                     = var.storage_account_name
+  resource_group_name      = azurerm_resource_group.example.name
+  location                 = azurerm_resource_group.example.location
+  account_tier             = "Standard"
+  account_replication_type = "LRS"
+}

modules/resource_group_storage/outputs.tf

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+output "resource_group_name" {
+  value = azurerm_resource_group.example.name
+}
+
+output "storage_account_name" {
+  value = azurerm_storage_account.example.name
+}

modules/resource_group_storage/variables.tf

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+variable "resource_group_name" {
+  description = "The name of the resource group"
+  type        = string
+}
+
+variable "location" {
+  description = "The Azure region to deploy resources"
+  type        = string
+  default     = "West US"
+}
+
+variable "storage_account_name" {
+  description = "The name of the storage account"
+  type        = string
+}