add

cv5/a_train.c

@@ -6,15 +6,16 @@
 #include "a_train.h"
 
 struct car* add_car(struct car* first,const char* target) {
-    struct car* newcar = calloc(1, sizeof(struct car));
     if(target == NULL){
-        exit(0);
+        return 0;
     }
-    strcpy(newcar->value, target);
-   
     if(first == NULL){
         return newcar;
     }
+
+    struct car* newcar = calloc(1, sizeof(struct car));
+    strcpy(newcar->value, target);
+   
     struct car *this = first;
     while(this->next != NULL){
         this = this->next;