Build Tower solution

src/main/java/com/algos/codewars/BuildTower.java

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+package com.algos.codewars;
+
+//Build Tower
+//
+//        Build a pyramid-shaped tower, as an array/list of strings, given a positive integer number of floors. A tower block is represented with "*" character.
+//
+//        For example, a tower with 3 floors looks like this:
+//
+//        [
+//        "  *  ",
+//        " *** ",
+//        "*****"
+//        ]
+//
+//        And a tower with 6 floors looks like this:
+//
+//        [
+//        "     *     ",
+//        "    ***    ",
+//        "   *****   ",
+//        "  *******  ",
+//        " ********* ",
+//        "***********"
+//        ]
+
+
+import java.util.Arrays;
+
+public class BuildTower {
+
+    public static void main(String[] args) {
+
+        System.out.println(Arrays.toString(towerBuilder(3)));
+    }
+
+    public static String[] towerBuilder(int nFloors) {
+
+        String[] result = new String[nFloors];
+        int stars = (nFloors - 1) * 2 + 1;
+        int spaces = 0;
+
+        for (int i = nFloors - 1; i >= 0; i--) {
+            result[i] = buildFloor(stars, spaces);
+            stars = stars - 2;
+            spaces++;
+        }
+
+        return result;
+    }
+
+    private static String buildFloor(int stars, int spaces) {
+
+        String spacesStr = " ".repeat(spaces);
+        return  spacesStr + "*".repeat(stars) + spacesStr;
+    }
+}