最近脑子真不好使

#include <stdio.h>
#include <stdlib.h>
void* icalloc(const unsigned int Multiple,const unsigned int Base);
int main(void)
{
  char *ptr = icalloc(5,sizeof(char));
  for(int i=0;i<4;++i)
  {
    *(ptr + i) = 'F';
  }
  printf("%s\n",ptr);
  return 0;
}
void* icalloc(const unsigned int Multiple,const unsigned int Base)
{
  void *ptr = malloc(Multiple * Base);
  for(void *cptr = ptr;cptr <= ptr + Multiple*Base;++cptr)
  {
    *(char*)cptr = 0;
  }
  return ptr;
}