c++ forbids converting string constant to char* code example

Example: COnvert string to char * C++

// CPP program to convert string 
// to char array 
#include <bits/stdc++.h> 
  
using namespace std; 
  
// driver code 
int main() 
{ 
    // assigning value to string s 
    string s = "geeksforgeeks"; 
  
    int n = s.length(); 
  
    // declaring character array 
    char char_array[n + 1]; 
  
    // copying the contents of the 
    // string to char array 
    strcpy(char_array, s.c_str()); 
  
    for (int i = 0; i < n; i++) 
        cout << char_array[i]; 
  
    return 0; 
}