prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -o main.o -c main.cpp 
g++ -g -Wall -o simulation.o -c simulation.cpp 
g++ -g -Wall -o event.o -c event.cpp 
g++ -g -Wall -o main main.o simulation.o event.o
finished

clean (3/3): 
finished

all task finished, build successfully