Fixed sonar issue

Author: Gentleman1983

build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 // project meta data
 group 'de.havox_design.aoc2023'
-version '0.18.0'
+version '0.18.1'
 
 // Switch to gradle "all" distribution.
 wrapper {

day18/src/main/kotlin/de/havox_design/aoc2023/day18/Day18.kt

@@ -86,7 +86,7 @@ class Day18(private var filename: String) {
 
     private fun List<Coordinate>.polygonArea(): Double =
         abs((1..<size)
-            .sumOf { it -> crossProduct(get(it), get(it - 1)) } / 2.0)
+            .sumOf { value -> crossProduct(get(value), get(value - 1)) } / 2.0)
 
     private fun crossProduct(a: Coordinate, b: Coordinate) =
         a.x.toLong() * b.y.toLong() - b.x.toLong() * a.y.toLong()