diff --git a/09-mostRepeatedChar/index.js b/09-mostRepeatedChar/index.js
index b113ed8..be923f9 100644
--- a/09-mostRepeatedChar/index.js
+++ b/09-mostRepeatedChar/index.js
@@ -1,4 +1,21 @@
 export function mostUsedChar(text) {
     // implementar logica aqui
-    return ""
+    let SIZE = 256
+            let count = new Array(SIZE);
+            for (let n = 0; n < SIZE; n++) {
+                count[n] = 0;
+            }
+            let len = text.length;
+            for (let i = 0; i < len; i++) {
+                count[text[i].charCodeAt(0)] += 1;
+            }
+            let max = -1;
+            let result = ' ';
+            for (let i = 0; i < len; i++) {
+                if (max < count[text[i].charCodeAt(0)]) {
+                    max = count[text[i].charCodeAt(0)];
+                    result = text[i];
+                }
+            }
+            return result;
 }
\ No newline at end of file