add API and the read

main.cpp

+#include "sorting.h"
+#include<iostream>
+#include<vector>
+using namespace std;
+int main(){
+int n;
+cin>>n;
+vector<int>p;
+ vector<int>q;
+for(int i=0;i<n;i++){
+int k;
+cin>>k;
+p.push_back(k);
+}
+q=sort_custom(p);
+ for(int z=0;z<q.size();z++){
+   cout<<q[z]<<" ";
+ }
+ cout<<endl;
+ return 0;
+}

sorting.h

+
+#include<vector>
+using namespace std;
+vector<int> sort_custom( vector<int> );