train

cv5/a_train.c

@@ -45,7 +45,7 @@ void print_train(struct car* first) {
 
 void cancel_train(struct car* first) {   
     if(first == NULL){
-        return;
+        return 0;
     }
     if(first->next != NULL){
        cancel_train(first->next);
@@ -65,14 +65,27 @@ struct car* clear_train(struct car* first, const char* target) {
     if(first == NULL){
         return 0;
     }
-    struct car* this = first;
-    while(this != NULL){
-        if(this->value == target){
-            return NULL;    
-        }
-        this = this->next;
-        
+    int x;
+    if(first->next == NULL){
+       x = strcmp(first->value; target);
+       if(x == 0){
+           free(first);
+           return 0;
+       }
     }
-    return first;
+    else{
+        struct car* prev = first;
+        while(prev->next->next != NULL){
+            x = strcmp(prev->next->value, target);
+            if(x == 0){
+                struct car* third = prev->next->next;
+                free(prev->next);
+                break;
+            }
+            prev = prev->next;
+        
+        }
+   }
+   return first;
 }