diff --git a/crc16.py b/crc16.py
index bd75c00..f3d1777 100644
--- a/crc16.py
+++ b/crc16.py
@@ -1,7 +1,5 @@
 import sys
 import ast
-import time
-from itertools import zip_longest
 
 class Polynomial:
 
@@ -77,7 +75,7 @@ def normalize_byte(data):
         if len(data) < 8:
             data = str(0) + data
         else:
-            data.replace(data[0], '')
+            data = data[1:]
     return data
 
 
@@ -126,7 +124,9 @@ def check_fcs(in_data):
 def main():
     try:
         if sys.argv[1] == '-e' or sys.argv[1] == '-encode':
-            print(encode(sys.argv[2]))
+            arg = encode(sys.argv[2])
+            print(arg)
+            print(check_fcs(arg)) # powinno zawsze zwracać true
         elif sys.argv[1] == '-c' or sys.argv[1] == '-check':
             print(check_fcs(sys.argv[2]))
         else:
@@ -136,4 +136,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    main()
\ No newline at end of file