how to ask question continuously until it meets requirements of having to meet a condition in c

i am using the cs50 online ide so i am also using the cs50 library at the top i am trying to make it so that when it asks are you okay it keeps asking the question until you either say upper or lowercase y or n

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

int main(void)
{
 
    char answer;
    do
    {
        char answer = get_char("are you okay Y/N ");
        if (answer == 'y' || answer == 'Y')
        {
            printf("you are okay");
        }
            else if (answer == 'n' || answer == 'N')
        {
            printf("you are not okay ");
        }

    }
   
    while(answer != 'y' || answer != 'Y' || answer != 'n' || answer != 'N');
    
}