Turn Wrapper to singleton

src/STree.h

@@ -0,0 +1,16 @@
+#ifndef STREE_H
+#define STREE_H
+#include "PyClassifier.h"
+
+namespace pywrap {
+    class STree : public PyClassifier {
+    public:
+        STree() : PyClassifier("stree", "Stree") {};
+        ~STree() = default;
+        void version();
+    private:
+
+    };
+
+} /* namespace pywrap */
+#endif /* STREE_H */