C++ STRING类 两个字符串交叉插入生成第三个字符串

#pragma warning(disable : 4996) //此处VS需要用到，其他编译环境可以把此行屏蔽掉
#include <iostream>
#include <string.h>
using namespace std;
class STRING
{
private:
    char str1[60] ;
    char str2[40] ;
    char str3[100];

public:
    STRING(char* s1, char* s2)
    {        
        strcpy(str1,s1);
        strcpy(str2, s2);
        strcpy(str3, "");
    }
    void process()
    {
        int m = 0, n = 0;
        for (int i = 0; i < 100; i++) {
            if (i % 2 == 0) {
                str3[i] = str1[m++];
            }
            else {
                str3[i] = str2[n++];
            }
        }
    }

    void print()
    {
        cout << str3 << endl;
    }

};
int main()
{
    char a[] = "abcde";
    char b[] = "ABCDEFG";
    STRING test(a,b);
    test.process();
    test.print();
    
}