better DEBUG for sender

src/sender_utils.c

@@ -72,7 +72,7 @@ int send_pkt(sender_state_t *state, pkt_t *pkt, uint8_t position, int socket_fd)
     ssize_t sent = send(socket_fd, packet_to_be_sent, len, 0);
     if (sent == -1) 
     {
-        ERROR("The sending (using send) of the pkt failed");
+        ERROR("The sending (using the function send from <sys/socket.h>) of the pkt failed");
         return -1;
     }
     
@@ -151,6 +151,7 @@ int handle_returning_ack_nack(sender_state_t *state, int socket_fd)
             state->r_window_size = r_window;
 
             uint8_t upper_bound = (place_last_ack + 1) % WINDOW_SIZE; // The oldest seqnum sended
+            DEBUG("The sender is cumulatively acknowledging [%d : %d[ (place in the buffer)", state->tail, upper_bound);
             // A do while is necessary here in case we want to make a full revolution (ack from 1 to 1 not included for example)
             do 
             {
@@ -214,7 +215,7 @@ int read_and_send(sender_state_t *state, int sending_fd, int socket_fd)
     {
         nbr_byte_read = 0;
         state->last_pkt_sent = CLOSING_PKT;
-        DEBUG("The closing pkt has been sent !");
+        DEBUG("The CLOSING pkt has been sent !");
     }
     else 
     {
@@ -232,7 +233,7 @@ int read_and_send(sender_state_t *state, int sending_fd, int socket_fd)
     {
         pkt_set_timestamp(pkt, SECOND_TO_LAST_PKT);
         state->last_pkt_sent = LAST_DATA_PKT;
-        DEBUG("The last DATA TYPE is being sent !");
+        DEBUG("The LAST DATATYPE is being sent !");
     }
     else
     {