add function round

include/toolkit.h

@@ -10,6 +10,7 @@
 #include <ios>
 #include <vector>
 #include <ranges>
+#include <cmath>
 
 namespace ranges = std::ranges;
 namespace views = std::ranges::views;
@@ -97,6 +98,14 @@ namespace toolkit
                                                          { return T(word.begin(), word.end()); });
         return std::vector<T>(v.begin(), v.end());
     }
+    
+    double round(double value, int c){
+        auto temp = 1;
+        for(int i=0;i<c;i++){
+            temp=temp*10;
+        }
+        return std::round(value*temp)/temp;
+    }
 
 }