add API and read data

main.cpp

 #include "sorting.h"
 #include <iostream>
+
 using namespace std;
+
 int main(){
 	int n;
 	cin>>n;
 	vector<int> inp(n),out;
-	for (int i=0;i<n;i++) cin>>inp[i];
+	for (int i=0;i<n;i++)
+		cin>>inp[i];
+
 	out=sort_custom(inp);
-	for (int i=0;i<n;i++) cout<<out[i]<<" ";
+	
+	for (int i=0;i<n;i++)
+		cout<<out[i]<<" ";
 	return 0;
 }