Date Solver for calendar puzzle

Run ./gradlew run/gradlew.bat run or Main.kt from IDE
Open in browser http://localhost:8080/solve?day=#day&month=#month filling in the date (numbering is 1 based - 1st of January would be http://localhost:8080/solve?day=1&month=1)
You can add a &random to get a random solution every call i.e. http://localhost:8080/solve?day=29&month=2&random