struct Connection {
   FILE *fp;
   struct Core *core;
};

struct Core {
	struct Config *cnf;
	struct Database *db;
};

struct Config {
	int size;
	int free_index;
	int delete_index;
};

struct Database {
   struct Information *rows;
};

struct Information {
   int index;
   char name[MAX_DATA];
   char phone[MAX_DATA];
};

void DatabaseSort(struct Connection *conn)
{
	int i;
	char *tmp1;
	char *tmp2;

	for (i = 0; i < conn->core->cnf->delete_index; i++)
		if ((strncmp(conn->core->db->rows[i].name, conn->core->db->rows[i + 1].name, MAX_DATA)) == 1) {
			tmp1 = conn->core->db->rows[i + 1].name;
			tmp2 = conn->core->db->rows[i + 1].phone;
			conn->core->db->rows[i + 1].name = conn->core->db->rows[i].name;  -----> error: incompatible types in assignment
			conn->core->db->rows[i + 1].phone = conn->core->db->rows[i].phone; -----> error: incompatible types in assignment
			conn->core->db->rows[i].name = tmp1; -----> error: incompatible types in assignment
			conn->core->db->rows[i].phone = tmp2; -----> error: incompatible types in assignment
		}
}

strncpy(conn->core->db->rows[i + 1].name, conn->core->db->rows[i].name, MAX_DATA - 1);