Each statement class in separate file

src/Parser/Statement/StatementExpression.h

@@ -0,0 +1,11 @@
+#include "Parser/Statement/Statement.h"
+
+class StatementExpression: public Statement {
+private:
+    shared_ptr<Expression> expression;
+
+public:
+    StatementExpression(shared_ptr<Expression> expression);
+    shared_ptr<Expression> getExpression();
+    string toString(int indent) override;
+};