Construct function prototypes that match the following descriptions:
a. igor() takes no arguments and has no return value.
b. tofu() takes an int argument and returns a float.
c. mpg() takes two type double arguments and returns a double.
d. summation() takes the name of a long array and an array size as values and returns a long value.
e. doctor() takes a string argument (the string is not to be modified) and returns a double value.
f. ofcourse() takes a boss structure as an argument and returns nothing.
g. plot() takes a pointer to a map structure as an argument and returns a string.