Error C4996: 'strcpy' // Не помогает define

#include<iostream>
#include "stdio.h"
using namespace std;
class Students
{
private:
    int student_number;
    char* student_name;
    char* student_surname;
    double mark;
public:
    friend ostream& operator<<(ostream& str, const Students& person)
    {
        cout << "\n Student name: " << "\t"<<person.student_name << "\nStudent surname: " <<"\t"<< person.student_surname << "\n Mark: " <<"\t"<< person.mark << "\n";
        return str;
    }
    Students() : student_name(nullptr), student_surname(nullptr), mark(0.0)
    {}
    Students(const char* student_name, const char* student_surname, double mark)
    {
 
 
        this->student_name = (char*)calloc(strlen(student_name), sizeof(student_name));
        strcpy(this->student_name, student_name);
        this->student_surname = (char*)calloc(strlen(student_surname), sizeof(student_surname));
        strcpy(this->student_surname, student_surname);
        this->mark = mark;
    }
    void change_name(const char* new_name)
    {
 
        free(this->student_name);
        this->student_name = (char*)calloc(strlen(new_name), sizeof(new_name));
        strcpy(this->student_name, new_name);
    }
    void change_surname(const char* new_surname)
    {
 
        free(this->student_surname);
        this->student_surname = (char*)calloc(strlen(new_surname), sizeof(new_surname));
        strcpy(this->student_surname, new_surname);
    }
    void change_mark(double new_mark)
    {
        this->mark = new_mark;
    }
    void index(int index)
    {
        this->student_number = index;
    }
    char* getName()
    {
        return this->student_name;
    }
    double getMark()
    {
        return this->mark;
    }
 
    int get_index()
    {
        return student_number;
    }
    ~Students()
    {
        free(student_name);
        free(student_surname);
    }
 
};
#define _CRT_SECURE_NO_WARNINGS
int main()
{
 
 
    return 0;
}