Add the implementation for the function getOrdinalNumber

Author: Iswanna

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

@@ -1,5 +1,12 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  if (num === 1 || num === 21) {
+    return `${num}st`;
+  } else if (num === 11) {
+    return `${num}th`;
+  } else if (num === 2) {
+    return `${num}nd`;
+  }
 }
 
+
 module.exports = getOrdinalNumber;