String to binary Convert with atoi Function

#include<iostream>
#include<conio.h>
#include <stdlib.h>

using namespace std;
void Stringr(char *s);
int main()
{
char str[100];

cout << "Enter String: >>:";
cin >> str;
Stringr(str);   
getch();
return 0;
}
void Stringr(char *s)
{
char Buffer[9];  
while(*s)
{ 
itoa(*s,Buffer,2);
puts(Buffer);

s++;
}

}