5 XIN token bounty: Improve Mixin Network Java SDK

Task: Improve the existing Java SDK to support all Mixin Network API .

Award: 5 XIN Token (about $700) for the best solution.

Process:
Contact me via email lilin@mixin.one, or via Mixin Messenger ID 31367
Create an open source repo on GitHub, write your code, let me know your repo address.

Timeline:
Submit your code before April 12.
The final result will be announced before April 20.

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