Implement getOrdinalNumber function to return correct ordinal suffixes

Author: Alex-Os-Dev-Lab

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,5 +1,26 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  // Calculate the remainder when divided by 100 to check for 11, 12, 13
+  const lastTwoDigits = number % 100;
+
+  // Calculate the remainder when divided by 10 to get the single last digit
+  const lastDigit = number % 10;
+
+  // 1. The "teen" exceptions (11th, 12th, 13th)
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return number + "th";
+  }
+
+  // 2. Apply standard rules based on last digit
+  if (lastDigit === 1) {
+    return number + "st";
+  } else if (lastDigit === 2) {
+    return number + "nd";
+  } else if (lastDigit === 3) {
+    return number + "rd";
+  } else {
+    // Cover 0, 4, 5, 6, 7, 8, and 9
+    return number + "th";
+  }
 }
 
 module.exports = getOrdinalNumber;