How can i Assign value to char** inside structure

I have a structure where I have char ** inside it , I have another pointer of type char * How can I assign value to it ? I tried strcpy() but it is giving me error argument of type "char **" is incompatible with parameter of type "char *".

struct tmp{

   char **ptr1;

   int x ; 

}

void foo( struct tmp *t, char *ptr){

   t->ptr1 = ptr;
 
   t->x = 0;

}

I tried with strcpy() but getting error
Can someone help me out here .

>Solution :

You need to alocate the space for the pointer.

void foo( struct tmp *t, char *ptr)
{
   t->ptr1 = malloc(sizeof(*t -> ptr1);
   *t->ptr1 = ptr;
   t->x = 0;
}