input: Write a function to generate an HTML template with a title and a heading.
  assert generate_html("My Favorite Programming Language", "My favorite programming language is Python!") == """<!DOCTYPE html>
  <html>
      <head>
          <title>My Favorite Programming Language</title>
      </head>
      <body>
          <h1>My favorite programming language is Python!</h1>
      </body>
  </html>"""
  assert generate_html("Welcome", "Welcome to my website!") == """<!DOCTYPE html>
  <html>
      <head>
          <title>Welcome</title>
      </head>
      <body>
          <h1>Welcome to my website!</h1>
      </body>
  </html>"""
  assert generate_html("About", "About me") == """<!DOCTYPE html>
  <html>
      <head>
          <title>About</title>
      </head>
      <body>
          <h1>About me</h1>
      </body>
  </html>"""
output: def generate_html(title, heading):
      return f"""<!DOCTYPE html>
  <html>
      <head>
          <title>{title}</title>
      </head>
      <body>
          <h1>{heading}</h1>
      </body>
  </html>"""