feat: completing getOrdinalNumber function

Author: zakiaao-tech

practice-tdd/get-ordinal-number.js

@@ -1,6 +1,25 @@
 export function getOrdinalNumber(num) {
+  if (num % 100 === 11) {
+    return `${num}th`;
+  }
+  if (num % 100 === 12) {
+    return `${num}th`;
+  }
+
+  if (num % 100 === 13) {
+    return `${num}th`;
+  }
+
   if (num % 10 === 1) {
     return `${num}st`;
   }
-  return "1st";
+
+  if (num % 10 === 2) {
+    return `${num}nd`;
+  }
+
+  if (num % 10 === 3) {
+    return `${num}rd`;
+  }
+  return `${num}th`;
 }