char msg 为长度148的字符串将其两两字符组合起来变成就buff74

char msg = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&()"; char buff[74];

for(int i = 0; i < 74; i++) { buff[i] = msg[i*2]; }

buff[74] = '\0';