int main(int argc, char * argv[]){
char file_extension[10];
strncat(file_extension, argv[2][5], 6);
int main(int argc, char * argv[]){
char filint main(int argc, char * argv[]){
char file_extension[10];
strncat(file_extension, argv[2][5], 6);
int main(int argc, char * argv[]){
char fil