diff --git a/09-mostRepeatedChar/index.js b/09-mostRepeatedChar/index.js
index b113ed8..28f1041 100644
--- a/09-mostRepeatedChar/index.js
+++ b/09-mostRepeatedChar/index.js
@@ -1,4 +1,15 @@
 export function mostUsedChar(text) {
-    // implementar logica aqui
-    return ""
-}
\ No newline at end of file
+  if (!text) return { error: 'Not Found Text' };
+
+  let max = 0,
+    maxChar = '';
+
+  for (let char of text) {
+    if (text.split(char).length > max) {
+      max = text.split(char).length;
+      maxChar = char;
+    }
+  }
+
+  return maxChar;
+}