Complete the code for the provided Sequence class. Your code should provide the expected results when run through the provided SequenceTester class. Add code for these two methods in the Sequence class: public Sequence append(Sequence other) append creates a new sequence, appending this and the other sequence, without modifying either sequence. For example, if a is 1 4 9 16 and b is the sequence 9 7 4 9 11 then the call a. append(b) returns the sequence 1 4 9 16 9 7 4 9 11 without modifying a or b. public Sequence merge(Sequence other) merges two sequences, alternating elements from both sequences. If one sequence is shorter than the other, then alternate as long as you can and then append the remaining elements from the longer sequence. For example, if a is 1 4 9 16 and b is 9 7 4 9 11 then a. merge(b) returns the sequence without modifying a or b. 3. 1 9 4 7 9 4 16 9 11