Strdup usage in C

Strdup usage in C

Let's say we have a struct :
struct Person {
char *name;
};
struct Person *Person_create(char *name){
struct Person *who = malloc(sizeof(struct Person));
assert(who != NULL);
who->name = strdup(name);
return who;
}
void Person_destroy(struct Person *who){
assert(who != NULL);
free(who->name);
free(who);
}
And the main function :
int main(int argc,char *argv[]){
struct Person *mike = Person_create("mike");
Person_print(mike);
Person_destroy(mike);
return 0;
}
The above code won't work properly without the strdup() function. Valgrind
says that the address you try to free with free(who->name) is not
malloc'd. What's the story behind this, didn't I malloc'd that memory when
I malloc'd the struct? And what difference does the strdup() make?