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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class StringUtils {
    public static String convertInputStreamToString(InputStream in) throws IOException {
        StringBuilder sb = new StringBuilder();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
        String line;
        while (null != (line = reader.readLine())) {
            sb.append(line);
        }
        return sb.toString();
    }

    private StringUtils() {}
}