update

index.js

@@ -0,0 +1,33 @@
+const fs = require('fs');
+
+function create(fileName, emoji) {
+  const startTime = Date.now();
+  let data = fs.readFileSync('README.md', 'utf8');
+  const emojis = new Set(["🪟", "🍎", "🐧", "🟢", "⭐"]);
+  let result = [];
+  let lineCount = 0;
+  const lines = data.split('\n');
+  
+  for (let i = 0; i < lines.length; i++) {
+    let line = lines[i];
+    if (lineCount < 20) {
+      result.push(line);
+      lineCount++;
+      continue;
+    }
+    line = line.replace(/ /g, '');
+    if ([...emojis].some(emojiChar => line.includes(emojiChar)) && !line.includes(emoji)) {
+      continue;
+    }
+    result.push(lines[i]);
+  }
+
+  fs.writeFileSync(`${fileName}.md`, result.join('\n'));
+  console.log(`${fileName} execution time: ${Date.now() - startTime}ms`);
+}
+
+create("windows-only", "🪟");
+create("macOS-only", "🍎");
+create("linux-only", "🐧");
+create("open-source-only", "🟢");
+create("recommended-only", "⭐");