diff --git a/src/index.js b/src/index.js
index d25ae68..b97f3ab 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,15 @@
 function diamond(size) {
   // your code
-  return;
+  if (size % 2 === 0 || size < 3) {
+    return null;
+  }
+  let text = '';
+  for (let i = 0; i < size; i++) {
+    const level = 2 * i + 1;
+    text += `${' '.repeat(Math.abs(size - level) / 2)}${'*'.repeat(size - Math.abs(size - level))}\n`;
+  }
+  //console.log(diamond);
+  return text;
 }
 
-module.exports = { diamond };
+module.exports = { diamond };
\ No newline at end of file