use to_string to replace itos

include/toolkit.h

@@ -5,32 +5,44 @@
 #include <expected>
 #include <type_traits>
 #include <string_view>
+#include <string>
+#include <ios>
 
 //use for to_chars
 constexpr size_t buffer_size = 32;
 
+template <typename T>
+concept _num_type = requires {
+    std::is_same_v<T, int> ||
+    std::is_same_v<T, float> ||
+    std::is_same_v<T, long> ||
+    std::is_same_v<T, double>;
+};
+
 namespace toolkit{
-	//number to std::string;
     template<typename T>
-    std::expected<std::string, std::string> itos(T value){
+    std::expected<std::string, std::string> to_string(T value){
+        if constexpr (std::is_same_v<T, int> || std::is_same_v<T, float> || std::is_same_v<T, double>){
             char buffer[buffer_size];
-        auto res = std::to_chars(buffer, buffer+buffer_size, value);
+            auto res = std::to_chars(buffer, buffer + buffer_size, value);
-        if(res.ec != std::errc()){
+            if (res.ec != std::errc()) {
                 return std::unexpected(std::make_error_code(res.ec).message());
             }
             return std::string(buffer, res.ptr - buffer);
+        } else if constexpr (std::is_same_v<typename std::remove_const<T>::type,
+                                            char *>) {
+          return std::to_string(value);
+        }
     }
 
     template<typename T = double>// requires std::is_same_v<T, std::string>
     std::expected<T, std::string> stoi(const std::string& str){
         T value;
-        
         auto res = std::from_chars(str.c_str(), str.c_str() + str.size(), value);
         if(res.ec != std::errc()){
             return std::unexpected(std::make_error_code(res.ec).message());
         }
         return value;
-        
     }
 }