toggling stm32 led using structure types - c

Question

hello i am new with the stm32 board i am trying to toggle the user led that is connected to port A pin 5 (nucleo l476rg board) , I wrote this program from scratch using structure types but unfortunately the led is not blinking … I double checked all the addresses because i tried it without the structures and it worked , can any one tell me what’s the problem here ? here's the code:
// Port A
// pin 5
#include <stdint.h>
#define periph_base (0x40000000UL)
#define ahb2_offset (0x08000000UL)
#define ahb2_base (periph_base + ahb2_offset)
#define ahb1_offset (0x20000UL)
#define ahb1_base (periph_base + ahb1_offset)
#define gpioa_offset (0x000000UL)
#define gpioa_base (ahb2_base + gpioa_offset)
#define rcc_offset (0X1000UL)
#define rcc_base (ahb1_base + rcc_offset)
#define rcc_ahb2enr_offset (0x4CUL)
#define rcc_ahb2enr (*(volatile unsigned int *)(rcc_base +rcc_ahb2enr_offset))
#define gpioa_moder_offset (0x00UL)
#define gpioa_moder (*(volatile unsigned int*)(gpioa_base +gpioa_moder_offset))
#define odr_offset (0X14UL)
#define odr (*(volatile unsigned int*)(gpioa_base + odr_offset))
#define gpioa_en (1U<<0)
#define pin5 (1U<<5)
#define led_pin pin5
typedef struct
{
volatile uint32_t MODER;
volatile uint32_t DUMMY[4];
volatile uint32_t ODR;
}gpio_Typedef;
typedef struct
{
volatile uint32_t DUMMY[16];
volatile uint32_t AHB2ENR;
}rcc_Typedef;
#define RCC ((rcc_Typedef*) rcc_base)
#define GPIOA ((gpio_Typedef*) gpioa_base)
int main(void)
{
RCC->AHB2ENR |= gpioa_en;
GPIOA->MODER |= (1U<<10);
GPIOA->MODER &=~ (1U<<11);
while(1)
{
GPIOA->ODR ^= led_pin;
for(long int i =0; i<100000;i++){}
}
}

Answer 1

It appears that i had the wrong reference manual , in the rcc_Typedef Structure the dummy array should have 19 as size not 16 , there are 19 registers before the rcc_ahb2enr .