add sample 2

src/index.ts

@@ -1,3 +1,5 @@
 
 
-export { default as sample } from "./sample"
+export { default as power } from "./sample"
+
+export { default as sqrt } from "./sample2"

src/sample2.ts

@@ -0,0 +1,11 @@
+const sqrt = (n : number): number | undefined => {
+    if( typeof n === "undefined" || n === null){
+        return  undefined
+    }
+    if(typeof n !== "number"){
+        return undefined
+    }
+    return Math.sqrt(n)
+}
+
+export default sqrt