typedef struct _integersequenz integersequenz;

struct _integersequenz {
    int* elements;
    size_t len;
};

integersequenz better_encrypt(integersequenz* , integersequenz*);
integersequenz better_decrypt(integersequenz* , integersequenz*);
integersequenz build_integersequenz(int[], int);
void free_integersequenz(integersequenz*);
void print_integer_sequenz(integersequenz*);