add number to std::string funtion

include/toolkit.h

@@ -0,0 +1,23 @@
+#ifndef TOOLKIT_H
+#define TOOLKIT_H
+
+#include <charconv>
+#include <expected>
+
+//use for to_chars
+constexpr size_t buffer_size = 32;
+
+namespace toolkit{
+	//number to std::string;
+    template<typename T>
+    std::expected<std::string, std::string> itos(T value){
+        char buffer[buffer_size];
+        auto res = std::to_chars(buffer, buffer+buffer_size, value);
+        if(res.ec != std::errc()){
+            return std::unexpected(std::make_error_code(res.ec).message());
+        }
+        return std::string(buffer, res.ptr - buffer);
+    }
+}
+
+#endif

src/main.cpp

@@ -1,9 +1,11 @@
 #include <iostream>
-
+#include <toolkit.h>
 using namespace std;
 
 int main(int argc, char** argv)
 {
-    cout << "hello world!" << endl;
+    double num = .2;
+    auto str = toolkit::itos(num);
+    cout<<str.value()<<"\n";
     return 0;
 }