Developing a switch statement within a while statement/off by one and input errors

Question

I am trying to develop the main menu for a project in school and I cannot figure out how to best scan get my menu option as a character and have it select properly from the switch statement. It is off by one, as in i will enter G for the first time, it loops without changing or outputting anything, I will enter a different letter, and it outputs the results I had needed for my previous input. This loop continues, and does not exit until I enter the exit condition followed by another input.

I have tried restructuring the do/while statement, as well as convert all of the letters to a single case for a simpler switch structure using toupper().

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



int main() {
    
     char menuOption = '\0';

    printf("*****************************************\n");
    printf("          Welcome to the Races!          \n");
    printf("     Select from the menu to continue    \n");
    printf("*****************************************\n");
    printf("\n");
     
     do{
        
         printf("**************     MENU    **************\n");
         printf("*  [G]amble                             *\n");
         printf("*  [B]anking                            *\n");
         printf("*  [R]ace Results                       *\n");
         printf("*  [L]eave the Track                    *\n");
         printf("*****************************************\n");
        
         scanf("%c\n", &menuOption);
         
         switch(menuOption){
             case 'G':
             case 'g':
                 printf("Case G\n");
                 break;
                 //Insert Function to jump to gambling options
             case 'B':
             case 'b':
                 printf("Case B\n");
                 break;
                 //Insert Functions to show tabulated banking
             case 'R':
             case 'r':
                 printf("Case R\n");
                 break;
                 //Insert Functions to show results and wagers from gambling
             case 'l':
             case 'L':
                 break;
             default:
                 printf("%c is not a valid menu option. Please enter a valid menu option.\n", menuOption);
                 return 0;
                 
         }
         
         printf("You have entered %c.\n", menuOption);

     }while (menuOption != 'l' || menuOption != 'L');
    
    printf("Thank you for gambling with us!");
    // Proper exit message
           
    return 0;
}