/*

Ðåàëèçóéòå ìåòîä, êîòîðûé çà÷èòàåò äàííûå èç InputStream è ïðåîáðàçóåò èõ â ñòðîêó, èñïîëüçóÿ çàäàííóþ êîäèðîâêó.

Ïðèìåð

InputStream ïîñëåäîâàòåëüíî âîçâðàùàåò ÷åòûðå áàéòà: 48 49 50 51.

Ìåòîä, âûçâàííûé äëÿ òàêîãî InputStream è êîäèðîâêè ASCII, äîëæåí âåðíóòü ñòðîêó "0123".

*/

private static final int BUFFER_SIZE = 4 * 1024;

public static String readAsString(InputStream inputStream, Charset charset) throws IOException {

// your implementation here

StringBuilder builder = new StringBuilder();

InputStreamReader reader = new InputStreamReader(inputStream, charset);

char[] buffer = new char[BUFFER_SIZE];

int length;

while ((length = reader.read(buffer)) != -1) {

builder.append(buffer, 0, length);

}

return builder.toString();

}