Begin splitting code into separate files.

include/types.hpp

@@ -0,0 +1,28 @@
+#pragma once
+#include <mpfr.h>
+#include <string>
+#include "config.hpp"
+
+struct string {
+    std::string value;
+    string(std::string&& new_value) : value(std::move(new_value)) {}
+    string(const std::string& new_value) : value(new_value) {}
+};
+
+struct number {
+    mpfr_t value;
+    number(const char* new_value) {
+        mpfr_init2(value, PRECISION);
+        mpfr_set_str(value, new_value, 10, MPFR_RNDN);
+    }
+    number(mpfr_t&& new_value) {
+        std::swap(value, new_value);
+    }
+    int to_int() {
+        return mpfr_get_si(value, MPFR_RNDN);
+    }
+    ~number() {
+        mpfr_clear(value);
+    }
+};
+