diff --git a/src/index.js b/src/index.js
index 2f46b4b..086637b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,8 +1,8 @@
 const { StackObj } = require ('./stack-obj');
 
 function baseConverter(decNumber, base) {
-  // your code
-  return ;
+  if(base < 2 || base > 36) return null
+  return decNumber.toString(base).toUpperCase();
 }
 
-module.exports = { baseConverter };
+module.exports = { baseConverter };
\ No newline at end of file