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README.md

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+>>>>>DISCLAIMER
+>>>>>
+>>This is a demonstration project. So, it's over-engineered a bit.
+>>You may run into spagetti inside ;)
+
+
+A simple string calculator based on Clean Architecture.
+
+>Layers:
+* CORE >>> calculating string expression
+* UI >>> user input handling, calculation result handling
+
+>Features:
+* simple arithmetic operations (addition, subtraction, multiplication, division)
+* unary subtraction
+* operation's priority assignment