diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day1.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day01.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day1.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day01.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day2.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day02.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day2.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day02.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day3.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day03.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day3.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day03.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day4.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day04.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day4.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day04.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day5.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day05.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day5.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day05.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day6.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day06.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day6.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day06.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day7.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day07.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day7.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day07.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day8.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day08.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day8.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day08.scala diff --git a/src/main/scala/de.qwertyuiop.aoc/2021/day9.scala b/src/main/scala/de.qwertyuiop.aoc/2021/day09.scala similarity index 100% rename from src/main/scala/de.qwertyuiop.aoc/2021/day9.scala rename to src/main/scala/de.qwertyuiop.aoc/2021/day09.scala