add task solution

src/app.js

@@ -1 +1,20 @@
-// write code here
+const fs = require('fs');
+const path = require('path');
+
+let destination = process.argv[3];
+const sourceFile = process.argv[2];
+
+try {
+  const destinationIsDirectory =
+    fs.existsSync(destination) && fs.statSync(destination).isDirectory();
+
+  if (destinationIsDirectory) {
+    const newFileName = path.basename(sourceFile);
+
+    destination = path.join(destination, newFileName);
+  }
+
+  fs.renameSync(sourceFile, destination);
+} catch (error) {
+  global.console.error(error);
+}