added macro as bonus

exercises/practice/protein-translation/.docs/instructions.append.md

@@ -0,0 +1,13 @@
+# Instructions append
+
+This is a good exercise to experiment with non-standard string literals.
+
+A short introduction to non-standard string literals can be found in this [blog post](https://web.archive.org/web/20170625222109/https://iaindunning.com/blog/julia-unicode.html). 
+
+You can extend your solution by adding the functionality described below.
+
+## Bonus
+Implement a string literal that translates RNA strings as:
+```julia
+rna"AUGUGU" == ["Methionine", "Cysteine"]
+```

exercises/practice/protein-translation/runtests.jl

@@ -77,4 +77,12 @@ include("protein-translation.jl")
     @testset "Incomplete RNA sequence can translate if given a stop codon" begin
         @test rna_to_amino_acids("UGGUGAUG") == ["Tryptophan"]
     end
-end
+
+    # Bonus
+    if isdefined(@__MODULE__, Symbol("@rna_str"))
+        @eval @testset "Bonus: rna string macro" begin
+            @test rna"AUGUUUUUAUGGUACUAG" == ["Methionine", "Phenylalanine", "Leucine", "Tryptophan", "Tyrosine"]
+        end
+    end
+
+end