Align desired multiple addressed memory allocation

/*Align memory of desired multiple number address (except prime ) allocated*/
#include <stdlib.h>
#include<stdio.h>

void  *allign_alloc(size_t allign ,size_t bytes)
{
   size_t *book = NULL ;
 const  size_t total_size = bytes+allign+sizeof(size_t );

  char *data = (char *)malloc(sizeof(char)*total_size) ;

   const void * const data_row = data  ;
    data = data + sizeof(size_t) ;

  const size_t offset = allign - ((size_t)data%allign)  ;

    data+=offset  ;

    book = (size_t*)data - sizeof(size_t );

    *book = (size_t )data_row ;

  return data ;

}
int main()
{
int *ptr = allign_alloc(7,30) ;

printf("\n%s\n%u",(char*)((((size_t)ptr%7)==0)?"Yes":"NO"),(unsigned)ptr) ;


 getchar();
free((void*)*(ptr-sizeof(size_t))) ;
return 0 ;
}