Each statement class in separate file

src/Parser/Statement/StatementInvalid.h

@@ -0,0 +1,12 @@
+#include "Parser/Statement/Statement.h"
+
+class StatementInvalid: public Statement {
+private:
+    shared_ptr<Token> token;
+    string message;
+
+public:
+    StatementInvalid(shared_ptr<Token> token, string message);
+    string toString(int indent) override;
+    string getMessage();
+};