fix NJUPT and update charset_convert

[crccw]

[51isoft]

^{vjudge-v2/AizuJudger.cpp, line 171 [r1] (raw file):} So this is not buffer any more

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^{vjudge-v2/GlobalHelpers.cpp, line 319 [r1] (raw file):} Comment is wrong

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^{vjudge-v2/GlobalHelpers.h, line 19 [r1] (raw file):} remove

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^{vjudge-v2/HDUJudger.cpp, line 190 [r1] (raw file):} ditto

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^{vjudge-v2/NJUPTJudger.cpp, line 187 [r1] (raw file):} ditto

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Comments from the review on Reviewable.io

[crccw]

^{vjudge-v2/AizuJudger.cpp, line 171 [r1] (raw file):} my fault...

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^{vjudge-v2/GlobalHelpers.cpp, line 319 [r1] (raw file):} Done.

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^{vjudge-v2/GlobalHelpers.h, line 19 [r1] (raw file):} Done.

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^{vjudge-v2/HDUJudger.cpp, line 190 [r1] (raw file):} Done.

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^{vjudge-v2/NJUPTJudger.cpp, line 187 [r1] (raw file):} Done.

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Comments from the review on Reviewable.io

[51isoft]

^{vjudge-v2/GlobalHelpers.cpp, line 325 [r2] (raw file):} space-1

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Comments from the review on Reviewable.io

[crccw]

^{vjudge-v2/GlobalHelpers.cpp, line 325 [r2] (raw file):} Done.

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Comments from the review on Reviewable.io