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public text v1 · immutableException in thread "main" java.lang.NullPointerException
at vetoffice.Bill.<init>(Bill.java:30)
at vetoffice.Veterinarian.bellyUpCheck(Veterinarian.java:55)
at vetoffice.Runner.main(Runner.java:55)Exception in thread "main" java.lang.NullPointerException
at vetoffice.Bill.<init>(Bill.java:30)
at vetoffice.Veterinarian.bellyUpCheck(Veterinarian.java:55)
at vetoffice.Runner.main(Runner.java:55)