improved content types

deno.json

@@ -1,7 +1,7 @@
 {
   "name": "@bearmetal/router",
   "description": "A simple router for Deno",
-  "version": "0.2.4",
+  "version": "0.2.5",
   "stable": true,
   "files": [
     "mod.ts",

router.ts

@@ -393,7 +393,7 @@ export class Router {
 
       try {
         const file = await Deno.readFile(normalizedPath);
-        const filetype = normalizedPath.split(".")[1];
+        const filetype = normalizedPath.split(".").at(-1);
         const contentType = getContentTypeByExtension(filetype);
         return new Response(file, { headers: { "Content-Type": contentType } });
       } catch (e) {

util/contentType.ts

@@ -1,4 +1,4 @@
-export function getContentTypeByExtension(extension: string) {
+export function getContentTypeByExtension(extension?: string) {
   switch (extension) {
     case "html":
     case "htm":