Rename Utils to Hashing

This name suits much better since the other functions have moved out
already and the file's single responsibility has become clear.

Author: rhaendel

…otlin/de/ronny_h/aoc/extensions/Utils.kt …lin/de/ronny_h/aoc/extensions/Hashing.ktsrc/main/kotlin/de/ronny_h/aoc/extensions/Utils.kt renamed to src/main/kotlin/de/ronny_h/aoc/extensions/Hashing.kt src/main/kotlin/de/ronny_h/aoc/extensions/Utils.kt renamed to src/main/kotlin/de/ronny_h/aoc/extensions/Hashing.kt

@@ -3,7 +3,7 @@ package de.ronny_h.aoc.extensions
 import io.kotest.core.spec.style.StringSpec
 import io.kotest.matchers.shouldBe
 
-class UtilsTest : StringSpec({
+class HashingTest : StringSpec({
 
     "md5() converts a String to an MD5 hash" {
         "This is just a test".md5() shouldBe "df0a9498a65ca6e20dc58022267f339a"