pleae read carefully and use function C

List of Problems Write in the Racket programming language the function ???, where ??? is the first letter of your family name. The function ??? must be designed from scratches. If you want to use - build-in functions - standard functions or - library functions different from car, cdr, null, null?, first, rest, if, define, and, or you need the instructor's permission. function C Factorial of a nonnegative integer number - factorial(x)