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third_party/tinyexpr/README.md

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+a light weight math expression parser library from https://github.com/codeplea/tinyexpr.
+
+```
+mkdir build && cd build
+cmake ..
+make
+```
+
+1. library `libtinyexpr.so` saved to `build/libs`
+2. sample `tinyexpr_test` saved to `build/samples`
+
+run sample and input math expression something like `1+2*5`, it will calculate it and output result `11`.