空函数，但函数参数中存在分段错误

typedef struct {
    char T[MaxEl+1][MAX_CHAR];
    address TOP;
    boolean alive;//ignore this
} Stack;

void expandP(Stack stack[],int i,char input[]) {//variable stack is array of Stack
    ..

    Stack temp;
    CreateEmpty(&temp);
    ..
    copyStack(&temp,stack[i]);
}

void CreateEmpty(Stack *S) {
    Top(*S) = Nil;
    isAlive(*S) = false;
}

void copyStack(Stack* out,Stack in) {

}