Solution

main.tf

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+resource "random_id" "unique_suffix" {
+  byte_length = 4
+}
+
+module "resource_group_storage" {
+  source               = "v-shutov/resource_group_storage/azurerm"
+  version              = "1.0.2"
+  resource_group_name  = var.resource_group_name
+  location             = var.location
+  storage_account_name = "${var.storage_account_name}${random_id.unique_suffix.hex}"
+}

modules/resource_group_storage/main.tf

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+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_id" {
+  value = azurerm_resource_group.example.id
+
+}
+
+output "storage_account_id" {
+  value = azurerm_storage_account.example.id
+}

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 location for all resources."
+  type        = string
+}
+
+variable "storage_account_name" {
+  description = "The name of the storage account"
+  type        = string
+}

provider.tf

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+terraform {
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "3.105.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+}

variables.tf

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+variable "resource_group_name" {
+  description = "The name of the resource group"
+  type        = string
+  default     = "my-rg"
+}
+
+variable "location" {
+  description = "The location for all resources."
+  type        = string
+  default     = "West Europe"
+}
+
+variable "storage_account_name" {
+  description = "The name of the storage account"
+  type        = string
+  default     = "mystorageacct"
+}