plz give some explnations.

3. Programming Collections (a) [3] Write a function called capitalize that takes as a parameter a string and capital izes the first character in each word. A word is defined as any continuous sequence of alphabet characters. An alphabet character is one between A-Z and a-z The function should return: i. A string. ii. It should return the input string with one exception: It should capitalize the first character in each word. You can use the following functions: bool isalpha (char c); // returns true if c is an alphabet character char toupper (char c); // if isalpha (c) return the // otherwise returns false // capitalized version of c // otherwise return c Example: capitalize ("this is the sea") capitalize ("this") capitalize ("this is.not") capitalize ("this,is,the sea") capitalize("This is") capitalize("") "This Is The Sea" "This" "This Is.Not" "This,Is, The Sea" "ThisIs" TI IT