Refactor: Move license price calculation to new function

Author: xetxeberria

exercises/tiered_pricing/solutions/xetxeberria-ts/src/tieredPricing.ts

@@ -1,4 +1,10 @@
 export function tieredPricing(licenseAmount: number): number {
+  const licensePrice = calculateLicensePrice(licenseAmount);
+
+  return licensePrice * licenseAmount;
+}
+
+function calculateLicensePrice(licenseAmount: number): number {
   let licensePrice = 299;
   if (licenseAmount >= 3) {
     licensePrice = 239;
@@ -7,5 +13,5 @@ export function tieredPricing(licenseAmount: number): number {
     licensePrice = 219;
   }
 
-  return licensePrice * licenseAmount;
+  return licensePrice;
 }