Iterate password array from AA through zz

#include <stdio.h>
#include <cs50.h>
#include <string.h>

int main(void)
{

    //first set (A - z)
    char password[5] = {'A', '\0', '\0', '\0', '\0'};
    while (password[0] <= 'z')
    {
        printf("%s\n", password);
        password[0]++;
        if (password[0] == 91)
        {
            password[0] = 97;
        }
    }

     //second set, (AA - zz)
    password[0] = 'A';
    password[1] = 'A';
    while (password[0] <= 'z' && password[1] <= 'z')
    {
        printf("%s\n", password);
        //iterate second char
        if (password[1] != 'z')
        {
            password[1]++;
            if (password[1] == 91)
            {
                password[1] = 97;
            }
        }
        //if second char is 'z' then set back to 'A' and iterate first char
        else
        {
            password[1] = 'A';
            password[0]++;
            if (password[0] == 91)
            {
                password[0] = 97;
            }
        }
    }

}