Fix BuildingGetPrice() and remove getSumPrice()

src/Sim/SimulationEvents/BuyBuilding.js

@@ -1,7 +1,5 @@
 /**
  * This function calculates the total price for buying "increase" of a building
- * Base Game does not currently allow this
- * It is called by CM.Cache.CacheBuildingsPrices() and CM.Disp.Tooltip()
  * @param	{string}	build		Name of the building
  * @param	{number}	basePrice	Base Price of building
  * @param	{number}	start		Starting amount of building
@@ -10,14 +8,11 @@
  * @returns {number}	moni		Total price
  */
 export default function BuildingGetPrice(build, basePrice, start, free, increase) {
-  let startingAmount = start;
-  let moni = 0;
-  for (let i = 0; i < increase; i += 1) {
-    let price = basePrice * Game.priceIncrease ** Math.max(0, startingAmount - free);
-    price = Game.modifyBuildingPrice(build, price);
-    price = Math.ceil(price);
-    moni += price;
-    startingAmount += 1;
+  let partialPrice = 0;
+  for (let i = Math.max(0, start); i < Math.max(0, start + increase); i++) {
+    partialPrice += Game.priceIncrease ** Math.max(0, i - free);
   }
-  return moni;
+  let price = basePrice * partialPrice;
+  price = Game.modifyBuildingPrice(Game.Objects[build], price);
+  return Math.ceil(price);
 }