Created end to end demo

client-tauri/src/utils/file-utils.ts

@@ -0,0 +1,9 @@
+
+
+export function appendToFilename(inputPath: string, toAppend: string) {
+    const parts = inputPath.split('.');
+    if (parts.length > 1) {
+        parts[parts.length-2] = parts[parts.length-2] + toAppend;
+    }
+    return parts.join(".");
+}