Java version: 11
java -jar kenneth-show-booking-0.0.1-SNAPSHOT.jar
MAX_ROWS = 26 and MAX_SEATS_PER_ROW = 10
Every row will have same MAX_SEATS_PER_ROW
Only 1 booking per phone# per show but 1 phone# can book multiple shows
Phone numbers are unique
Show numbers are unique
Data are in memory using jdbc:h2