The StringBuilder class is provided in the Java library. Provide your own implementation for the following methods (name the new class MyStringBuilder1):
public MyStringBuilder1(String s);public MyStringBuilder1 append(MyStringBuilder1 s);public MyStringBuilder1 append(int i);public int length();public char charAt(int index);public MyStringBuilder1 toLowerCase();public MyStringBuilder1 substring(int begin, int end);public String toString();
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