Exercise 4.4: General Character Exclusion

Given: an array of characters, chr_array and an array of forbidden characters, forbidden_chr_array;
Compose: a loop that returns an array of the characters from chr_array that are not elements of the array forbidden_chr_array.
for chr in chr_array
returns array of chr unless for forbidden_chr in forbidden_chr_array
                            returns value of sum chr = forbidden_chr
                            end for
end for

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