Refactor reset display

Author: zalbright90

main.js

@@ -10,12 +10,10 @@ document.addEventListener('DOMContentLoaded', function() {
 
     function updateDisplay(value) {
         if (calculationJustCompleted && !isNaN(value) && value !== ".") {
-            displayValue = "";
-            calculationJustCompleted = false;
+            resetDisplay();
         }
         if (displayValue === "0" && value !== ".") {
             displayValue = "";
-            calculationJustCompleted = false;
         }
         displayValue += value;
         if (displayValue.length > MAX_DISPLAY_LENGTH) {
@@ -24,6 +22,11 @@ document.addEventListener('DOMContentLoaded', function() {
         displayOutput.textContent = displayValue;
     }
 
+    function resetDisplay() {
+        displayValue = "";
+        calculationJustCompleted = false;
+    }
+
     function clearDisplay() {
         displayValue = "0";
         firstNumber = "";