diff --git a/du5/program.c b/du5/program.c
index 8310b4b..a61819f 100644
--- a/du5/program.c
+++ b/du5/program.c
@@ -41,22 +41,14 @@ Tree* readTree() {
     return node;
 }
 
-int EmptyLine() {
-    char line[SIZE];
-
-    if (fgets(line, SIZE, stdin) == NULL) return 0;
-
-    return line[0] == '\n';
-}
-
 int Leaves(Tree *node) {
-    if (node == NULL) return 0;
+    if (!node) return 0;
     if (node->isAnswer) return 1;
     return Leaves(node->yes) + Leaves(node->no);
 }
 
 void freeTree(Tree *node) {
-    if (node == NULL) return;
+    if (!node) return;
     freeTree(node->yes);
     freeTree(node->no);
     free(node);
@@ -65,7 +57,7 @@ void freeTree(Tree *node) {
 void start(Tree *node) {
     char input[SIZE];
 
-    while (node != NULL && node->isAnswer == 0) {
+    while (node && node->isAnswer == 0) {
         printf("%s\n", node->text);
 
         if (fgets(input, SIZE, stdin) == NULL) {
@@ -96,8 +88,7 @@ int main() {
     printf("Expert z bufetu to vie.\n");
 
     Tree *root = readTree();
-
-    if (root == NULL) {
+    if (!root) {
         printf("Chyba nacitania\n");
         return 0;
     }