diff --git a/du4/main.c b/du4/main.c
new file mode 100644
index 0000000..dacf73b
--- /dev/null
+++ b/du4/main.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include "train.h"
+
+int main() {
+    struct car* vlak = NULL;
+
+    vlak = add_car(vlak, "Kosice");
+    vlak = add_car(vlak, "Presov");
+    vlak = add_car(vlak, "Bratislava");
+    vlak = add_car(vlak, "Kosice");
+    vlak = add_car(vlak, "Poprad");
+
+    printf("Povodny vlak:\n");
+    print_train(vlak);
+
+    vlak = clear_train(vlak, "Kosice");
+    printf("\nPo odstraneni 'Kosice':\n");
+    print_train(vlak);
+
+    cancel_train(vlak);
+    vlak = NULL;
+
+    printf("\nPo zruseni vlaku:\n");
+    print_train(vlak);
+
+    return 0;
+}
diff --git a/du4/output/train.exe b/du4/output/train.exe
index 67d8328..4279acd 100644
Binary files a/du4/output/train.exe and b/du4/output/train.exe differ
diff --git a/du4/train.c b/du4/train.c
index efd5b2b..b12d15c 100644
--- a/du4/train.c
+++ b/du4/train.c
@@ -49,15 +49,39 @@ void print_train (struct car* first) {
 
 void cancel_train (struct car* first) {
     struct car* current = first;
-    while (current ! = NULL) {
-        struct car* next_one = current->next;
+    while (current !=NULL) {
+        struct car* next_one = current->next;// запоминаем следующий вагон
            memset(current->value, 0, SIZE);
             free(current);
-            current = next_one;;
+            current = next_one;; // переходим к следующему вагону
     }
 }
 
+struct car* clear_train(struct car* first, const char* target) {
+    if (first == NULL) {
+        return NULL;
+    }
+
+    struct car* current = first; // текущий вагон
+    struct car* previous = NULL;  // предыдущий вагон
+
+    while (current !=NULL) {
+        if (strcmp(current->value, target)==0) {
+            if (previous==NULL) {
+                struct car* new_start = current->next; //Сохраняем адрес второго вагона
+                free(current);
+                current = new_start; //Двигаем курсор на следующий вагон
+                first = new_start; //Обновляем начало поезда
+                continue;
+            }
+        } else {
+             previous->next = current->next;
+            free(current);
+            current = previous->next;
+            continue;
+        }
+    }
+    previous = current;
+    current = current->next;
+}
 
-int main() {
-    return 0;
-}
\ No newline at end of file
diff --git a/du4/train.exe b/du4/train.exe
new file mode 100644
index 0000000..7b8c3a6
Binary files /dev/null and b/du4/train.exe differ