The attached project is a poorly written products API in C#.

Please evaluate and refactor areas where you think can be improved.

Consider all aspects of good software engineering and show us how you'll make it #beautiful and make it a production ready code.

There should be these endpoints:

1. GET /products - gets all products.
2. GET /products?name={name} - finds all products matching the specified name.
3. GET /products/{id} - gets the project that matches the specified ID - ID is a GUID.
4. POST /products - creates a new product.
5. PUT /products/{id} - updates a product.
6. DELETE /products/{id} - deletes a product and its options.
7. GET /products/{id}/options - finds all options for a specified product.
8. GET /products/{id}/options/{optionId} - finds the specified product option for the specified product.
9. POST /products/{id}/options - adds a new product option to the specified product.
10. PUT /products/{id}/options/{optionId} - updates the specified product option.
11. DELETE /products/{id}/options/{optionId} - deletes the specified product option.

All models are specified in the /Models folder, but should conform to:

Product:

{
  "Id": "01234567-89ab-cdef-0123-456789abcdef",
  "Name": "Product name",
  "Description": "Product description",
  "Price": 123.45,
  "DeliveryPrice": 12.34
}

Products:

{
  "Items": [
    {
      // product
    },
    {
      // product
    }
  ]
}

Product Option:

{
  "Id": "01234567-89ab-cdef-0123-456789abcdef",
  "Name": "Product name",
  "Description": "Product description"
}

Product Options:

{
  "Items": [
    {
      // product option
    },
    {
      // product option
    }
  ]
}