fix symmetry

src/quadtree.c

@@ -119,7 +119,7 @@ void swap(quadtree *ptr1, quadtree *ptr2){
 
 error_code quadtree_horizontal_symmmetry(quadtree p_quadtree){
 	error_code err = 0;
-	if(p_quadtree != NULL){
+	if(p_quadtree->child[0] != NULL){
 		for(int i = 0; i < 4; i++){
 			run_func(quadtree_horizontal_symmmetry(p_quadtree->child[i]));
 		}
@@ -131,7 +131,7 @@ error_code quadtree_horizontal_symmmetry(quadtree p_quadtree){
 
 error_code quadtree_vertical_symmmetry(quadtree p_quadtree){
 	error_code err = 0;
-	if(p_quadtree != NULL){
+	if(p_quadtree->child[0] != NULL){
 		for(int i = 0; i < 4; i++){
 			run_func(quadtree_vertical_symmmetry(p_quadtree->child[i]));
 		}

src/quadtree_tool.c

@@ -71,7 +71,7 @@ int main(int argc, char *argv[]) {
 		run_func(matrix_to_quadtree(p_qtree1, &p_pgm1->mat, 0, n_max, p_pgm1->mat.m/2, p_pgm1->mat.m/2, p_pgm1->mat.n/2));
 
 		print_applying("horizontal symmetry qtree1");
-		//run_func(quadtree_horizontal_symmmetry(p_qtree1));					            	// symmetry
+		run_func(quadtree_horizontal_symmmetry(p_qtree1));					            	// symmetry
 
 		//print_applying("vertical symmetry qtree1");
 		//run_func(quadtree_vertical_symmmetry(p_qtree1));					              // symmetry