fix message type conflict and function return type#10

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weemma wants to merge 4 commits intotud-amr:masterfrom weemma:master

+47-21

Commits on Aug 21, 2023

fix message type conflict and function return type
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Commits on Aug 22, 2023

change goal reach condition and fix loop mode bug
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update README
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Commits on Aug 24, 2023

modify the way of printing solving time
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