decode_str('755g60m68');
res1: 1
unxor_str: 0  0 7
unxor_str: 1  0 5
unxor_str: 2  0 5
unxor_str: 3  0 g
unxor_str: 4 T 0 6
unxor_str: 5 S 0 0
unxor_str: 6 0 m
unxor_str: 7  0 6
str_un_xored: 00000000
un-rail: 00000000
inum: 0
un_xor_num : icurpage: 0 iscore: 0

:
:
unrail: railway
unrail: railways