diff --git a/src/app.js b/src/app.js
index 0d15e7b..d032fd6 100644
--- a/src/app.js
+++ b/src/app.js
@@ -1 +1,48 @@
-// write code here
+/* eslint-disable no-console */
+'use strict';
+
+const fsCb = require('fs');
+const path = require('path');
+
+const [subject, destination] = process.argv.slice(2);
+
+if (process.argv.slice(2).length !== 2) {
+  console.error('Usage: node index <source> <destination>');
+
+  process.exit(0);
+}
+
+const fileName = path.basename(subject);
+let destinationIsDirectory = false;
+
+try {
+  destinationIsDirectory = fsCb.statSync(destination).isDirectory();
+} catch (error) {}
+
+const correctDestination = destinationIsDirectory
+  ? path.join(destination, fileName)
+  : destination;
+
+if (!destinationIsDirectory && destination.endsWith(path.sep)) {
+  console.error('Destination must be correct path');
+
+  process.exit(0);
+}
+
+try {
+  fsCb.accessSync(subject, fsCb.constants.F_OK);
+
+  if (fsCb.statSync(subject).isDirectory()) {
+    console.error('Subject must be a file');
+    process.exit(0);
+  }
+} catch (subError) {
+  console.error(`subject doesn't exist`);
+  process.exit(0);
+}
+
+try {
+  fsCb.renameSync(subject, correctDestination);
+} catch (err) {
+  console.error(err);
+}