feat: implement file renaming functionality

src/app.js

@@ -1 +1,70 @@
-// write code here
+const fs = require('fs');
+const path = require('path');
+
+function renameFile() {
+  const [, , oldPath, newPath] = process.argv;
+
+  if (!oldPath || !newPath) {
+    // eslint-disable-next-line no-console
+    console.error('Please provide both source and destination.');
+
+    return;
+  }
+
+if (!fs.existsSync(oldPath)) {
+    // eslint-disable-next-line no-console
+    console.error(`Source file does not exist: ${oldPath}`);
+    return;
+  }
+
+
+  const oldStats = fs.statSync(oldPath);
+  if (!oldStats.isFile()) {
+    // eslint-disable-next-line no-console
+    console.error(`Source path is not a file: ${oldPath}`);
+    return;
+  }
+
+  const endsWithSlash = newPath.endsWith('/') || newPath.endsWith('\\');
+
+  if (endsWithSlash && !fs.existsSync(newPath)) {
+    // eslint-disable-next-line no-console
+    console.error(`Destination directory does not exist: ${newPath}`);
+
+    return;
+  }
+
+  let finalDestination = newPath;
+
+  if (fs.existsSync(newPath)) {
+    const stats = fs.statSync(newPath);
+
+    if (stats.isDirectory()) {
+      finalDestination = path.join(newPath, path.basename(oldPath));
+    } else {
+      finalDestination = newPath;
+    }
+  } else {
+    const parentDir = path.dirname(newPath);
+
+    if (!fs.existsSync(parentDir)) {
+      // eslint-disable-next-line no-console
+      console.error(
+        `The directory for the new path does not exist: ${parentDir}`,
+      );
+
+      return;
+    }
+
+    finalDestination = newPath;
+  }
+
+  try {
+    fs.renameSync(oldPath, finalDestination);
+  } catch (err) {
+    // eslint-disable-next-line no-console
+    console.error(`Operation failed: ${err.message}`);
+  }
+}
+
+renameFile();