Each statement class in separate file

src/Parser/Statement/StatementMetaExternFunction.h

@@ -0,0 +1,15 @@
+#include "Parser/Parser.h"
+
+class StatementMetaExternFunction: public Statement {
+private:
+    string name;
+    vector<pair<string, ValueType>> arguments;
+    ValueType returnValueType;
+
+public:
+    StatementMetaExternFunction(string name, vector<pair<string, ValueType>> arguments, ValueType returnValueType);
+    string getName();
+    vector<pair<string, ValueType>> getArguments();
+    ValueType getReturnValueType();
+    string toString(int indent) override;
+};