first commit

cv4/a_train.c

@@ -0,0 +1,50 @@
+#include "a_train.h"
+#include <stdio.h>
+
+struct car* add_car(struct car* first,const char* target) {
+    strucr car* new_car = (struct car*)calloc(1,sizeof(struct car));
+    strcpy(new_car->value, target);
+    new_car->next = NULL;
+    if (first == NULL){
+        first = new_car;
+    }
+    else {
+	struct car* temp=first;
+	while(temp->next != NULL){
+	    temp = temp->next;
+	}
+	temp->next = new_car;
+    }
+    return first;
+}
+
+void print_train(struct car* first) {
+	struct car* this = first;
+	while(this != NULL){
+		printf("%s",this->value);
+		this = this->next;
+	}
+
+}
+
+void cancel_train(struct car* first) {
+	if (first != NULL){
+		cancel_train(first->next);
+		free(first);
+	}
+
+}
+
+
+struct car* clear_train(struct car* first, const char* target) {
+	struct car* this = first;
+	while( this->next->next != NULL){
+		if(strcmp(this->next->value, target, SIZE) == 0){
+			this->next == this->next->next; 
+			free(this);
+		}
+		this = this->next;
+	} 
+	return NULL;
+}
+