What is your opinion about init_malloc?

What is your opinion about init_malloc?
One problem it solves it to initialise a const objects on heap.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
void * init_malloc(size_t size, void * src)
{
   void * p = malloc(size);
   if (p) {
      memcpy(p, src, size );
   }
   return p;
}
#define ALLOC(OBJ) ((typeof(OBJ)*) init_malloc(sizeof(OBJ), &(OBJ)))
////////// SAMPLE  //////////
struct Mail {
     const int id;
};
int main () {
     struct Mail* p0 = ALLOC((struct Mail){.id= 1});
     struct Mail* p1 = init_malloc(sizeof *p1, &(struct Mail){.id= 1});
     auto         p2 = ALLOC((struct Mail){.id= 1});
}
(I also posted on reddit)