Customer Testimonial Formatter

**Context**: 
A customer testimonial formatter is a crucial tool for businesses to showcase customer satisfaction and build trust with potential clients. The goal is to create a well-structured and visually appealing format for customer testimonials that can be used across various marketing channels, including websites, social media, and print materials.

**Detailed Instructions**: 
Design a customer testimonial formatting system that takes into account the key elements of a testimonial, including the customer's name, photo, testimonial text, rating (if applicable), and the company or product name. The system should be flexible enough to accommodate testimonials of varying lengths and formats. The output should be a formatted testimonial that is easy to read and understand, with clear visual hierarchy and proper typography. Consider the following requirements:
- The customer's name should be displayed prominently, possibly in bold or italics.
- The testimonial text should be concise and easy to read, with a clear font and appropriate line spacing.
- If a rating is included, it should be displayed in a way that stands out, such as with stars or a numerical value.
- The company or product name should be included to provide context for the testimonial.
- The testimonial should be formatted to fit within a specific width or container, with the ability to adjust the layout based on the available space.

**Output Format**: 
The output should be a formatted string that represents the customer testimonial, using HTML or Markdown formatting to define the visual layout and styling. The output should include the following elements:
- Customer name
- Customer photo (if available)
- Testimonial text
- Rating (if applicable)
- Company or product name

**Examples**: 
Input:
- Customer name: John Doe
- Customer photo: https://example.com/johndoe.jpg
- Testimonial text: "I am extremely satisfied with the service I received from XYZ Corporation. The team was professional and responsive, and the quality of work was exceptional."
- Rating: 5/5 stars
- Company or product name: XYZ Corporation

Output (HTML):
```html
<div class="testimonial">
  <img src="https://example.com/johndoe.jpg" alt="John Doe">
  <p><strong>John Doe</strong> says:</p>
  <p>"I am extremely satisfied with the service I received from XYZ Corporation. The team was professional and responsive, and the quality of work was exceptional."</p>
  <p>Rating: <span class="rating">5/5 stars</span></p>
  <p>Company: XYZ Corporation</p>
</div>
```