feature: resolve exercício 09-mostRepeatedChar

09-mostRepeatedChar/index.js

@@ -1,4 +1,18 @@
 export function mostUsedChar(text) {
-    // implementar logica aqui
-    return ""
+    let charObj = {};
+    let maxCount = 0;
+    let maxChar = "";
+
+    for (let char of text) {
+        charObj[char] = ++charObj[char] || 1;
+    }
+
+    for (let char in charObj) {
+        if (charObj[char] > maxCount) {
+            maxCount = charObj[char];
+            maxChar = char;
+        }
+    }
+
+    return maxChar;
 }