fix ex_4.10

#include <iostream>
#include <cstring>

using std::cout; using std::endl;

int main()
{
	const char* cs1 = "Wangyue";
	const char* cs2 = "Pezy";

	size_t size = strlen(cs1) + strlen(cs2) + 2;
	char* cs3 = new char(size);

	strcpy_s(cs3, size, cs1);
	strcat_s(cs3, size, " ");
	strcat_s(cs3, size, cs2);

	cout << cs3 << endl;

	//delete cs3;

	return 0;
}