Initializacia

cv4/a_train.c

@@ -1,18 +1,67 @@
 #include "a_train.h"
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 struct car* add_car(struct car* first,const char* target) {
-    return NULL;
+    struct car* last = first;
+    struct car* newcar* = calloc(1, sizeof(struct car));
+    strcpy(newcar->value, target);
+    if (last != NULL){
+        struct car* current = last;
+        while(current->next != NULL){
+            current = current->next
+        }
+        current->next = newcar;
+    } else{
+        last = newcar;
+        return last;
+    }
+    return first;
 }
 
 void print_train(struct car* first) {
+    if(first != NULL){
+        struct car* current = first;
+        while(current->next != NULL){
+            printf("%s\n", current->value);
+            current = current->next;
+        }
+    }
 }
 
 void cancel_train(struct car* first) {
+    struct car* current = first;
+    while(first != NULL){
+        current = current->next;
+        free(first);
+        first = current;
+    }
 }
 
 
 struct car* clear_train(struct car* first, const char* target) {
-	return NULL;
+    if (first = NULL){
+        return NULL;
+    }
+    struct car* current = first, new_first = first;
+    if (first != NULL){
+        if(strcmp(first->destination, target) == 0){
+            new_first = new_first->next;
+            free(first);
+            first = new_first;
+        }
+    }
+
+    while (first->next != NULL) {
+        current = first->next;
+        if (strcmp(current->destination, target) == 0) {
+            first->next = current->next;
+            free(current);
+        } else {
+            first = current;
+        }
+    }
+    return new_first;
 }