add solution

src/app.js

@@ -1 +1,49 @@
-// write code here
+const fsPromises = require('fs/promises');
+const fs = require('fs');
+const path = require('path');
+
+async function main() {
+  const [source, destination] = process.argv.slice(2);
+
+  if (!source || !destination) {
+    throw new Error('Missing arguments');
+  }
+
+  if (!fs.existsSync(source)) {
+    throw new Error('Source file does not exist');
+  }
+
+  let correctPath;
+
+  if (destination.endsWith('/')) {
+    if (
+      !fs.existsSync(destination) ||
+      !fs.statSync(destination).isDirectory()
+    ) {
+      throw new Error('Destination directory does not exist');
+    }
+
+    correctPath = path.join(destination, path.basename(source));
+  } else if (
+    fs.existsSync(destination) &&
+    fs.statSync(destination).isDirectory()
+  ) {
+    correctPath = path.join(destination, path.basename(source));
+  } else {
+    const parentDir = path.dirname(destination);
+
+    if (parentDir !== '.' && !fs.existsSync(parentDir)) {
+      throw new Error('Parent directory does not exist');
+    }
+
+    correctPath = destination;
+  }
+
+  const dataFile = await fsPromises.readFile(source, 'utf-8');
+
+  await fsPromises.unlink(source);
+  await fsPromises.writeFile(correctPath, dataFile, 'utf-8');
+}
+
+// eslint-disable-next-line no-console
+main().catch((e) => console.error(e.message));