diff --git a/src/base.ts b/src/base.ts
new file mode 100644
index 0000000..c61d4fa
--- /dev/null
+++ b/src/base.ts
@@ -0,0 +1,25 @@
+import {clipboard, HeadlessCommand, toast} from "@kksh/api/headless";
+
+export class BaseExt extends HeadlessCommand {
+    _func: Function;
+
+    constructor(func: (text: string) => string) {
+        super();
+
+        this._func = func;
+    }
+
+    async load() {
+        if (!await clipboard.hasText()) {
+            await toast.error("Clipboard is empty");
+            return;
+        }
+
+        const clipboardText = await clipboard.readText();
+        const convertedText = this._func(clipboardText);
+
+        await clipboard.writeText(convertedText);
+        await toast.success(`Copied "${convertedText}"`);
+        return;
+    }
+}
diff --git a/src/camel-case.ts b/src/camel-case.ts
index c0286e7..7cb39e7 100644
--- a/src/camel-case.ts
+++ b/src/camel-case.ts
@@ -1,16 +1,10 @@
-import { clipboard, expose, HeadlessCommand, toast } from "@kksh/api/headless"
-import camelCase from "lodash/camelcase"
+import {expose} from "@kksh/api/headless";
+import camelCase from "lodash/camelcase";
+import {BaseExt} from "./base";
 
-class CamelCaseExt extends HeadlessCommand {
-	async load() {
-		if (!await clipboard.hasText()) return;
-
-		const clipboardText = await clipboard.readText();
-		const convertedText = camelCase(clipboardText);
-
-		await clipboard.writeText(convertedText);
-		await toast.success(`Copied: "${convertedText}"`);
-		return
+class CamelCaseExt extends BaseExt {
+	constructor() {
+		super(camelCase);
 	}
 }