[EN-1980] exchange code correction in all events

Author: iamishalkin

dxfeed/core/listeners/listener.pyx

@@ -31,7 +31,7 @@ cdef void trade_default_listener(int event_type,
             events[i] = TradeTuple(symbol=unicode_from_dxf_const_string_t(symbol_name),
                                    sequence=trades[i].sequence,
                                    price=trades[i].price,
-                                   exchange_code=unicode_from_dxf_const_string_t(&trades[i].exchange_code),
+                                   exchange_code=unicode_from_dxf_const_string_t(&trades[i].exchange_code, size=1),
                                    size=trades[i].size,
                                    tick=trades[i].tick,
                                    change=trades[i].change,
@@ -66,11 +66,11 @@ cdef void quote_default_listener(int event_type,
                                    time=quotes[i].time,
                                    time_nanos=quotes[i].time_nanos,
                                    bid_time=quotes[i].bid_time,
-                                   bid_exchange_code=unicode_from_dxf_const_string_t(&quotes[i].bid_exchange_code),
+                                   bid_exchange_code=unicode_from_dxf_const_string_t(&quotes[i].bid_exchange_code, size=1),
                                    bid_price=quotes[i].bid_price,
                                    bid_size=quotes[i].bid_size,
                                    ask_time=quotes[i].ask_time,
-                                   ask_exchange_code=unicode_from_dxf_const_string_t(&quotes[i].ask_exchange_code),
+                                   ask_exchange_code=unicode_from_dxf_const_string_t(&quotes[i].ask_exchange_code, size=1),
                                    ask_price=quotes[i].ask_price,
                                    ask_size=quotes[i].ask_size,
                                    scope=<int> quotes[i].scope)
@@ -102,7 +102,7 @@ cdef void summary_default_listener(int event_type, dxf_const_string_t symbol_nam
                                      prev_day_volume=summary[i].prev_day_volume,
                                      open_interest=summary[i].open_interest,
                                      raw_flags=summary[i].raw_flags,
-                                     exchange_code=unicode_from_dxf_const_string_t(&summary[i].exchange_code),
+                                     exchange_code=unicode_from_dxf_const_string_t(&summary[i].exchange_code, size=1),
                                      day_close_price_type=summary[i].day_close_price_type,
                                      prev_day_close_price_type=summary[i].prev_day_close_price_type,
                                      scope=summary[i].scope)
@@ -166,7 +166,7 @@ cdef void time_and_sale_default_listener(int event_type,
                                  event_flags=tns[i].event_flags,
                                  index=tns[i].index,
                                  time=tns[i].time,
-                                 exchange_code=unicode_from_dxf_const_string_t(&tns[i].exchange_code),
+                                 exchange_code=unicode_from_dxf_const_string_t(&tns[i].exchange_code, size=1),
                                  price=tns[i].price,
                                  size=tns[i].size,
                                  bid_price=tns[i].bid_price,