diff --git a/cv6/a_station.c b/cv6/a_station.c
index fc51530..6f83daf 100644
--- a/cv6/a_station.c
+++ b/cv6/a_station.c
@@ -11,6 +11,7 @@ struct station* create_station(){
 
 void destroy_station(struct station* station){
     for(int i = 0; i < station->track_count; i++){
+        //get one linked list from station
         struct car* this = station->tracks[i];
         while(this != NULL){
             struct car* delete = this;
@@ -26,42 +27,55 @@ void destroy_station(struct station* station){
 int select_track(struct station* station, const char* target){
     unsigned int hash = 0;
     for(int i = 0; target[i] != '\0'; i++){
-        hash = target[i] + (hash << 6) + (hash << 16) - hash;
+       hash += target[i]; 
+       //hash = target[i] + (hash << 6) + (hash << 16) - hash;
     }
-    if(hash < 0 || hash > station->track_count){
+    //if(hash < 0 || hash > station->track_count){
         hash = hash % station->track_count;
-    }
+    //}
     return hash;
 }
 
 void add_target_capacity(struct station* station,const char* target, int capacity){
+    //find hash
     int track = select_track(station, target);
+
+    //get right linked list(with help of hash)
     struct car* start = station->tracks[track];
     while(start != NULL){
         int x = strcmp(start->value, target);
+        //if the "wagon" track is similar to the target, then increment capacity 
         if(x == 0){
             start->capacity = start->capacity + capacity;
             return;
         }
         start = start->next;
     }
-    struct car* newcar = calloc(1, sizeof(struct car));
-    strcpy(newcar->value, target);
-    newcar->capacity = capacity;
-    newcar->next = start;
-    station->tracks[track] = newcar;
-    if(newcar->next){
-        return;
+
+    //if track is empty, create new "wagon"
+    if(station->track[track] == NULL){
+        struct car* new = calloc(1, sizeof(struct car));
+        strcpy(new->value, target);
+        new->capacity = capacity;
+        new->next = start;
+        station->tracks[track] = new;
+        /*if(new->next){
+            return;
+        }*/
     }
     return;   
 
 }
 
 int get_target_capacity(struct station* station,const char* target){
+    //find hash
     int track = select_track(station, target);
+    
+    //get right linked list
     struct car* start = station->tracks[track];
     while(start != NULL){
         int x = strcmp(start->value, target);
+        //if the target is similar to "wagon", than get the capacity 
         if(x == 0){
             return start->capacity;
         }
@@ -70,6 +84,7 @@ int get_target_capacity(struct station* station,const char* target){
     return 0;
 }
 
+//count all tracks
 int count_targets(struct station* station){
     int targets = 0;
     for(int i = 0; i < STATION_SIZE; i++){
@@ -79,10 +94,11 @@ int count_targets(struct station* station){
     }
     return targets;
 }
-
+//count capacity in all tracks
 int count_capacity(struct station* station){
     int capacity = 0;
     for(int i = 0; i < STATION_SIZE; i++){
+        //get one linked list and count there capacity      
         struct car* this = station->tracks[i];
         if(this != NULL){
             capacity = capacity + this->capacity;