Question 4c Implement a function, generateSequence which has an integer parameter length. The function generates and returns a string consisting of length unique integers and dashes, separated by commas (). The string starts with an integer, not necessarily 1. If length is 0 or negative, the function returns an empty string. If length is 1, the function returns a string of one integer. An example string is '2,3,-,-,7,8,9,-,11' when length is 9. Note that the string also satisfies these conditions: Integers are ordered in increasing order and neighbouring numbers are consecutive, e.g., 2 and 3 are consecutive and 7, 8 and 9 are consecutive. Integers immediately after a dash are at least one but not two more than the sum of the last integer before the dash and the number of dashes, e.g., the number after the first 2 dashes can be 6 or 7, and 7 is generated and included, instead of 6. Also, the number after the last dash can be 11 or 12, and 11 is generated and included, instead of 12. (10 marks) Question 4d Write a function, main which repeatedly prompts for the length of sequence to generate, calls the functions generate Sequence and checkSequence, and prints the output of both function calls until the user enters when prompted for the length. If the user enters negative numbers, display an error message and re-prompt the user. Sample run: to end: 10 Enter length of sequence to generate and to end: -2 Length of sequence must be a positive number Enter length of sequence to generate and 89,90,91,92,93,-,96,97,-,-: False Enter length of sequence to generate and 83, 84, 85, -,87,-,89,90,-,- : True to end: 10 to end: 9 Enter length of sequence to generate and 5,6,7,8,9,-,11,12,- : True Enter length of sequence to generate and to end: 0 (5 marks)