getOrdinalNumber function to return correct ordinal suffixes

Author: ashaahmed7

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

@@ -1,5 +1,23 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const last2Digits = String(num).slice(-2);
+  if (["11", "12", "13"].includes(last2Digits)) return `${num}th`;
+
+  const lastDigit = String(num).slice(-1);
+  let ordinalResult = "";
+  switch (lastDigit) {
+    case "1":
+      ordinalResult = `${num}st`;
+      break;
+    case "2":
+      ordinalResult = `${num}nd`;
+      break;
+    case "3":
+      ordinalResult = `${num}rd`;
+      break;
+    default:
+      ordinalResult = `${num}th`;
+  }
+  return ordinalResult;
 }
 
 module.exports = getOrdinalNumber;