refactor: simplify getOrdinalNumber function for clarity and efficiency

Author: alexandru-pocovnicu

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

@@ -1,26 +1,15 @@
 function getOrdinalNumber(num) {
-  const absNum = Math.abs(num);
-  const lastTwoDigits = absNum % 100;
-
-  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
-    return `${num}th`;
-  }
-
-  const lastDigit = absNum % 10;
-
-  if (lastDigit === 1) {
-    return `${num}st`;
-  }
-
-  if (lastDigit === 2) {
-    return `${num}nd`;
-  }
-
-  if (lastDigit === 3) {
-    return `${num}rd`;
-  }
-
-  return `${num}th`;
+  let numberToString = String(num);
+  let numberLastDigit = numberToString.slice(-1);
+  let numberLast2Digits = numberToString.slice(-2);
+
+  if (numberLastDigit === "1" && numberLast2Digits !== "11")
+    return numberToString + "st";
+  if (numberLastDigit === "2" && numberLast2Digits !== "12")
+    return numberToString + "nd";
+  if (numberLastDigit === "3" && numberLast2Digits !== "13")
+    return numberToString + "rd";
+  return numberToString + "th";
 }
 
 module.exports = getOrdinalNumber;