1. Identifying the header lines / prototypes of the following functions: a. A function called lastChars which uses a string as input and returns the last two characters in the string. b. A function called isSquare that responds to its caller the result of a test: the test is whether or not an integer is a perfect square. (For example, 16 is a perfect square, but 5 is not.) c. A function called sumDigits which returns the sum of the digits of an integer. d. A function called isSmall that returns an answer of true if a double precision parameter has a value between 0 and 0.001. (It returns false otherwise.) e. A function called randomColor. The function generates a random number and based on that number chooses a color. The color is returned.