prepare (1/2): 
finished

make (2/2): 
g++ -c main.cpp -Wall -std=c++11
g++ -c cipher.cpp -Wall -std=c++11 
g++ -c util.cpp -Wall -std=c++11
util.cpp: In function 'void char2int(char*, int, __mpz_struct (*)[1])':
util.cpp:10:18: warning: zero-length gnu_printf format string [-Wformat-zero-length]
  sprintf(temp, "");
                  ^
g++ main.o cipher.o util.o libgmp.a libgmpxx.a -Wall -std=c++11 -o c2 -static
finished

all tasks finished, build successfully