Revise paste Anonymous struct union

//-Wall -Wextra -Wpedantic -Wshadow -Wconversion
#include <stdio.h>
#include <stdlib.h>

#define TEST_A
#define TEST_B

typedef struct
{
    struct
    {
        union
        {
            unsigned char uc;
            unsigned int ui;
        } TEST_A;

unsigned int val_1;

} TEST_B;
    
    unsigned int val_2;
    
} block_1;

typedef struct
{
    struct
    {
        union
        {
            unsigned char uc;
            unsigned int ui;
        } TEST_C;

unsigned int val_1;

} TEST_D;
    
    unsigned int val_2;
    
} block_2;

typedef struct
{
    struct
    {
        union
        {
            unsigned char uc;
            unsigned int ui;
        };

unsigned int val_1;

};
    
    unsigned int val_2;
    
} block_3;

int main()
{
        
        block_1 b1;

b1.ui = 123;

unsigned int v = b1.ui;

printf("(1) %d\n", v);

block_2 b2;

b2.TEST_D.TEST_C.ui = 456;

v = b2.TEST_D.TEST_C.ui;

printf("(2) %d\n", v);

block_3 b3;

b3.ui = 789;

v = b3.ui;

printf("(3) %d\n", v);

return 0;
}

/*
Output:

(1) 123
(2) 456
(3) 789