Refactor TestSanitizeController for improved clarity

- Updated namespace for consistency.
- Changed constructor and method parameters to non-nullable strings.
- Enhanced method signatures for `Sanitize` and `Encoder`.
- Improved overall class structure and formatting for better readability.

EnvelopeGenerator.Web/Controllers/Test/TestSanitizeController.cs

@@ -2,12 +2,12 @@
 using Microsoft.AspNetCore.Mvc;
 using System.Text.Encodings.Web;
 
-namespace EnvelopeGenerator.Web.Controllers.Test
+namespace EnvelopeGenerator.Web.Controllers.Test;
+
+[ApiController]
+[Route("api/test/[controller]")]
+public class TestSanitizeController : ControllerBase
 {
-    [ApiController]
-    [Route("api/test/[controller]")]
-    public class TestSanitizeController : ControllerBase
-    {
     private readonly HtmlEncoder _htmlEncoder;
     private readonly HtmlSanitizer _sanitizer;
 
@@ -18,7 +18,7 @@ namespace EnvelopeGenerator.Web.Controllers.Test
     }
 
     [HttpGet("sanitize")]
-        public IActionResult Sanitize([FromQuery] string? input = null) => Ok(new
+    public IActionResult Sanitize([FromQuery] string input) => Ok(new
     {
         input,
         Sanitized = _sanitizer.Sanitize(input),
@@ -26,12 +26,10 @@ namespace EnvelopeGenerator.Web.Controllers.Test
         SanitizedDom = _sanitizer.SanitizeDom(input)
     });
 
-
     [HttpGet("encode")]
-        public IActionResult Encoder([FromQuery] string? input = null) => Ok(new
+    public IActionResult Encoder([FromQuery] string input) => Ok(new
     {
         input,
         Encoded = _htmlEncoder.Encode(input)
     });
-    }
 }