funguje

du4/Makefile

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+CFLAGS= -std=c99 -g -Wall
+
+all: train
+
+%.o: %.c
+	gcc -c -o $@ $< $(CFLAGS)
+
+train: main.o a_train.o
+	gcc main.o a_train.o -o train 
+
+clean:
+	rm *.o train
+

du4/a_train.c

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+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct car* add_car(struct car* first,const char* target) 
+{
+    struct car* newcar=calloc(1, sizeof(struct car));
+    strcpy(newcar->value, target);
+    newcar->next=NULL;
+    if (first==NULL) 
+    {
+        return newcar;
+    }
+    struct car* this=first;
+    while (this->next!=NULL) 
+    {
+        this=this->next;
+    }
+    this->next=newcar;
+    return first;
+    return NULL;
+}
+
+void print_train(struct car* first) 
+{
+    struct car* current=first;
+    while (current!=NULL) 
+    {
+        printf("%s\n", current->value);
+        current=current->next;
+    }
+}
+
+void cancel_train(struct car* first) 
+{
+    struct car* current=first;
+    while (current!=NULL) 
+    {
+        struct car* next=current->next;
+        free(current);
+        current=next;
+    }
+}
+
+
+struct car* clear_train(struct car* first, const char* target) 
+{
+    while (first!=NULL && strcmp(first->value, target)==0) 
+    {
+        struct car* temp=first;
+        first=first->next;
+        free(temp);
+    }
+    if (first==NULL) 
+    {
+        return NULL;
+    }
+    struct car* current=first;
+    while (current->next!=NULL) 
+    {
+        if (strcmp(current->next->value, target)==0) 
+        {
+            struct car* temp=current->next;
+            current->next=current->next->next;
+            free(temp);
+        }
+        else 
+        {
+            current=current->next;
+        }
+    }
+    return first;
+}

du4/a_train.h

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+#ifndef TRAIN_H
+#define TRAIN_H
+#define SIZE 100
+
+/**
+ * Jeden vozen vlaku
+ */
+struct car {
+    /**
+     * Nazov cielovej  stanice
+     */
+    char value[SIZE];
+    /**
+     * Smenik na dalsi vozen
+     */
+    struct car* next;
+};
+
+/**
+ * Prida vozen na koniec vlaku.
+ *
+ * @arg nazov cielovej stanice, ktory sa ma priradit novemu voznu.
+ * @return smernik na zaciatok vlaku.
+ */
+struct car* add_car(struct car* first,const char* target);
+
+
+/**
+ * Vypise vsetky vozne vo vlaku
+ *
+ * @arg smernik na prvy vozen
+ */
+void print_train(struct car* first);
+
+/**
+ * Zrusenie vsetkych voznov vo vlaku.
+ * @arg smernik na prvy vozen
+ */
+void cancel_train(struct car* first);
+
+/**
+ * Vyradenie vsetkych voznov, ktorych cielova stanica je target
+ *
+ * @arg smernik na prvy vozen
+ * @arg cielova stanica, ktora sa ma vyradit z vlaku.
+ * @return smernik na novy prvy vozen
+ *
+ */
+struct car* clear_train(struct car* first,const char* target);
+
+#endif // TRAIN_H

du4/main.c

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+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Testovaci subor pre vlak
+int main(){
+    struct car* train = NULL;
+    train = add_car(train,"Presov");
+    train = add_car(train,"Bratislava");
+    train = add_car(train,"Levoca");
+    train = add_car(train,"Spiska Nova Ves");
+    print_train(train);
+    clear_train(train,"Levoca");
+    print_train(train);
+    cancel_train(train);
+
+    return 0;
+}