Add math helpers

src/utils/math-helpers.hpp

@@ -0,0 +1,9 @@
+#pragma once
+#include <string>
+#include <variant>
+#include <optional>
+
+std::variant<double, std::string>
+EvalMathExpression(const std::string &expression);
+bool IsValidNumber(const std::string &);
+std::optional<double> GetDouble(const std::string &);