Read both part Q4(a), Q4(b), and Q4(c) before attempting the question. You can submit part Q4(a), Q4(b), and Q4(c) together. Question 4a Create and write a function countRepeatingChar(word: string): int, that returns the highest number of the “repeating letter” in the given parameter word. Assume the given parameter word is in lowercase. For example, countRepeatingChar(word) returns these values for the following words as parameters: – assistants 4 – that 2 – business 3 – count 1 Write a functio