Method insertInside

java/Chapter 9/Question9_6/QuestionA.java:7–11

(String str, int leftIndex)

public class QuestionA {
	public static String insertInside(String str, int leftIndex) {
		String left = str.substring(0, leftIndex + 1);
		String right = str.substring(leftIndex + 1, str.length());
		return left + "()" + right;
	}
	
	public static Set<String> generateParens(int remaining) {
		Set<String> set = new HashSet<String>();