prepare (1/3): 
finished

make (2/3): 
gcc -c main.c
gcc -c union_find.c
gcc -c graph.c
gcc -c kruskal.c
gcc -c prim.c
gcc -o main main.o union_find.o graph.o kruskal.o prim.o
finished

clean (3/3): 
finished

all task finished, build successfully