宏如何返回指向未对齐值的对齐指针？

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

void* getUnalignedPointer(void* ptr, size_t alignment) {
    uintptr_t address = (uintptr_t)ptr;
    uintptr_t misalignment = address % alignment;
    uintptr_t unalignedAddress = address - misalignment;
    return (void*)unalignedAddress;
}

int main() {
    int value = 10;
    int* alignedPtr = &value;
    int* unalignedPtr = getUnalignedPointer(alignedPtr, sizeof(int));

    printf("Aligned Pointer: %p\n", alignedPtr);
    printf("Unaligned Pointer: %p\n", unalignedPtr);

    return 0;
}