Program executes else directly (won' take input) (nested if) [closed]

I want to make a program in C to take input form user who wants a specific type of drink and not anything else but the code won't work properly and directly executes if statement

    #include <stdio.h>
    
    void main()
    {
        
    
        char ch_a, ch_b, ch_c, ch_cond_1='y', ch_cond_2='Y';
        if(ch_a == ch_cond_1 || ch_a == ch_cond_2)
        {
            printf("Is cold drink available?(Y/N): ");
            scanf("%c", &ch_a);
            if(ch_b == ch_cond_1 || ch_b == ch_cond_2)
            {
                printf("Is Sprite available?(Y/N): ");
                scanf("%c", &ch_b);
                if(ch_c == ch_cond_1||ch_c == ch_cond_2)
                {
                    printf("Is is available in 1.5 ltr?(Y/N: ");
                    scanf("%c", &ch_c);
                    printf("Your desired product is available");
                }
            }
        }
        else
        {
            printf("Your desired product isn't available");
        }
        return 0;
    }