
Problem 1: Use string primitives to create an
expression that concatenates prefix and suffix and adds "_" between
them (so you get "hello_world" when you run the program).
(@problem 1)
;; Complete Problem 1 below using the following constants
(define PREFIX "hello")
(define SUFFIX "world")

Problem 2: Use string primitives to create an
expression that adds "_" at position i (the position that is i
characters from the left of the string). Again, in this particular
example, the expected result is "hello_world".
;; Complete Problem 2 below using the following constants
(define STR "helloworld")
(define i 5)

Problem 3: Create an expression that counts
the number of pixels in the CAT image.
(@problem 3)
;; Complete Problem 3 below using the following constant
(define CAT
(bitmap/url
"https://edxcoursespdxkiczales.s3.amazonaws.com/HTC/lab/cat.png"))
Complete these problems:

Problem 4: Create an expression that computes
whether CAT is "tall" (height is larger than its width), "wide"
(width is larger than its height), or "square" (height is the same
as its width).
(@problem 4)
;; Complete Problem 4 below using CAT as defined above

Problem 5: Create an expression that computes
whether the first character in STR is "h". In this example, the
expected result is true.
(@problem 5)
;; Complete Problem 5 below using STR as defined above