The fourth one

du4/Makefile

@@ -0,0 +1,13 @@
+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 <string.h>
+#include <stdlib.h>
+
+struct car* add_car(struct car* first,const char* target) {
+    if(first == NULL){
+        first = calloc(1, sizeof(struct car));
+        strcpy(first->value, target);
+        return first;
+    }
+
+    struct car* temp = first;
+    while(temp->next){
+        temp = temp->next;
+    }
+    struct car* newCar = (struct car*)calloc(1, sizeof(struct car));
+    strcpy(newCar->value, target);
+    temp->next = newCar;
+    return first;
+
+}
+
+void print_train(struct car* first) {
+     struct car* temp = first;
+     while(temp){
+        printf("%s\n", temp->value);
+        temp = temp->next;
+
+     }
+
+    
+}
+
+void cancel_train(struct car* first) {
+    if(first == NULL){
+        return;
+    }
+    cancel_train(first->next);
+    free(first);
+}
+
+
+struct car* clear_train(struct car* first, const char* target) {
+    if(first == NULL){
+        return NULL;
+    }
+    if (first->next == NULL && strcmp(first->value, target) == 0)
+    {
+        free(first);
+        return NULL;
+    }
+    else if(first->next == NULL && strcmp(first->value, target) != 0){
+        return first;
+    }
+    struct car* temp = first;
+    struct car* next = first->next;
+    while (next->next)
+    {if(strcmp(next->value, target) == 0){
+        
+        temp->next = next->next;
+        free(next);
+        next = temp->next;
+
+    }
+    else{
+    temp = next;
+    next = next->next;}
+    
+    }
+    
+	return first;
+}
+

du4/a_train.h

@@ -0,0 +1,51 @@
+#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/input.txt

@@ -0,0 +1 @@
+Bratislava

du4/main.c

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+#include "a_train.h"
+#include <stdio.h>
+#include <ctype.h>
+
+// Testovaci subor pre vlak
+int main(){
+    char buff[1000];
+    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);
+    printf("Zadajte zoznam cieľových staníc a počet cestujúcich.\n");
+    printf("Zoznam zakončite prázdnym riadkom.\n");
+    while (fgets(buff, SIZE, stdin))
+    {
+            add_car(train, buff);
+
+    }
+    print_train(train);
+    printf("Zadajte stanicu, ktorá sa má vyradiť:\n");
+    char buff2[SIZE];
+    fgets(buff2, SIZE, stdin);
+    printf("%s\n", buff2);
+    printf("Výsledný vlak bez stanice %s bude:\n", buff2);
+    clear_train(train, buff2);
+    print_train(train);
+    
+    
+
+    return 0;
+}