fix stupid problem

validity_check.py

@@ -25,7 +25,7 @@ if __name__ == "__main__":
     modifs[0]= modifs[0][1:]
     modifs[1]=modifs[1][1:]
     
-    for i in range(modifs[0]):
+    for i in range(len(curr_line)):
         if i<3 and prev_line[i] != curr_line[i] :
             print('You modify your data !\n')
             exit(1)