prepare (1/3): 
finished

make (2/3): 
gcc -c -o main.o main.c -I.
gcc -c -o Prim.o Prim.c -I.
gcc -c -o Graph.o Graph.c -I.
gcc -o main main.o Prim.o Graph.o
finished

clean (3/3): 
finished

all task finished, build successfully