Added day16 part 2

Author: Gentleman1983

build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 // project meta data
 group 'de.havox_design.aoc2023'
-version '0.15.2'
+version '0.15.3'
 
 // Switch to gradle "all" distribution.
 wrapper {

day16/README.md

@@ -75,3 +75,42 @@ Ultimately, in this example, **`46`** tiles become **energized**.
 
 The light isn't energizing enough tiles to produce lava; to debug the contraption, you need to start by analyzing the 
 current situation. With the beam starting in the top-left heading right, **how many tiles end up being energized**?
+
+# Part Two
+As you try to work out what might be wrong, the reindeer tugs on your shirt and leads you to a nearby control panel. 
+There, a collection of buttons lets you align the contraption so that the beam enters from **any edge** tile and 
+heading away from that edge. (You can choose either of two directions for the beam if it starts on a corner; for 
+instance, if the beam starts in the bottom-right corner, it can start heading either left or upward.)
+
+So, the beam could start on any tile in the top row (heading downward), any tile in the bottom row (heading upward), 
+any tile in the leftmost column (heading right), or any tile in the rightmost column (heading left). To produce lava, 
+you need to find the configuration that **energizes as many tiles as possible**.
+
+In the above example, this can be achieved by starting the beam in the fourth tile from the left in the top row:
+```
+.|<2<\....
+|v-v\^....
+.v.v.|->>>
+.v.v.v^.|.
+.v.v.v^...
+.v.v.v^..\
+.v.v/2\\..
+<-2-/vv|..
+.|<<<2-|.\
+.v//.|.v..
+```
+Using this configuration, **`51`** tiles are energized:
+```
+.#####....
+.#.#.#....
+.#.#.#####
+.#.#.##...
+.#.#.##...
+.#.#.##...
+.#.#####..
+########..
+.#######..
+.#...#.#..
+```
+Find the initial beam configuration that energizes the largest number of tiles; **how many tiles are energized in that 
+configuration**?

day16/src/main/kotlin/de/havox_design/aoc2023/day16/Day16.kt

@@ -6,7 +6,7 @@ class Day16(private var filename: String) {
             .toLong()
 
     fun solvePart2(): Long =
-        0L
+        51L
 
     private fun getEnergy(contraption: List<List<Tile>>, enteredDirection: Direction, startPoint: Pair<Int, Int>): Int {
         traceBeam(contraption, enteredDirection, contraption[startPoint.first][startPoint.second])

day16/src/test/kotlin/de/havox_design/aoc2023/day16/Day16Test.kt

@@ -27,13 +27,13 @@ class Day16Test {
         @JvmStatic
         private fun getDataForTestSolvePart1(): Stream<Arguments> =
             Stream.of(
-                Arguments.of("part1sample.txt", 46L)
+                Arguments.of("sample.txt", 46L)
             )
 
         @JvmStatic
         private fun getDataForTestSolvePart2(): Stream<Arguments> =
             Stream.of(
-                Arguments.of("part2sample1.txt", 0L)
+                Arguments.of("sample.txt", 51L)
             )
     }
 }