Add new task

Day_1/Tasks_day_1.jl

@@ -21,7 +21,12 @@ begin
 	using PlutoUI
 	
 	function check_reverse_string()
-		if @isdefined reverse_string
+		if !@isdefined reverse_string
+			return md"""
+			🔴 The function `reverse_string` is not implemented yet 🤨
+			"""
+		end
+		
 		test_str = "BlablaHahaOKLOL"
 		
 		try
@@ -39,15 +44,41 @@ begin
 		return md"""
 		🟢 Nice, all is fine 👌
 		"""
-		else
+	end
+
+	function check_string_extraction()
+		if !@isdefined extracted
 			return md"""
-			🔴 The function `reverse_string` is not implemented yet 🤨
+			🔴 The variable `extracted` is not defined yet 🤨
 			"""
 		end
+		
+		test_str = "Hello World"
+		
+		try
+			if lowercase(extracted) != lowercase(test_str)
+				return md"""
+				🔴 "Hello world" is not extracted well yet 😢
+				"""
+			end
+		catch err
+			return md"""
+			🔴 Something is wrong with your variable `extracted` 😵
+			"""
+		end
+
+		return md"""
+		🟢 Nice, all is fine 👌
+		"""
 	end
 	
 	function check_squaring_difference()
-		if @isdefined squaring_difference
+		if !@isdefined squaring_difference
+			return md"""
+			🔴 The function `squaring_difference` is not implemented yet 🤨
+			"""
+		end
+		
 		random_numbers = (331, 236, 69, 738, 949, 631, 761, 119, 729, 280)
 		results_to_random_numbers = (3006919850, 777687850, 5720330, 74226126612, 202912760050, 39674819100, 83918590100, 50410780, 70671821220, 1540279020)
 	
@@ -68,11 +99,6 @@ begin
 		return md"""
 		🟢 Nice, all is fine 👌
 		"""
-		else
-			return md"""
-			🔴 The function `squaring_difference` is not implemented yet 🤨
-			"""
-		end
 	end
 	
 	md""
@@ -148,6 +174,30 @@ Example: "string" would get "gnirts".
 # ╔═╡ d5bff992-e8b2-4f72-8943-db8ac4a671eb
 check_reverse_string()
 
+# ╔═╡ be7120b3-3dbe-4af7-b7b9-a4ede45f6cf3
+md"""
+# String extraction
+
+Extract the string "Hello world" out of the string variable `mess` defined below.
+
+The space between the two words must be included!
+
+The extracted string should be contained in a variable named `extracted`.
+
+Hint: Remember that strings are a chain of characters. So you can use a lot of what you have learned about vectors on strings.
+"""
+
+# ╔═╡ c5c5ac69-6167-4078-8b8c-ac46a6d0be58
+#       12345678901234567890123456789
+mess = "OHLENLNLMUIOQ WNHSIDWNOURLDSD"
+
+# ╔═╡ 9f4d8332-5814-4625-9f5c-1056ee095428
+# Your code starts here
+
+
+# ╔═╡ 35bcd481-acec-4c29-bfe6-732d3c4d09b0
+check_string_extraction()
+
 # ╔═╡ be22832f-2004-49ec-911c-96e7e790ba5a
 md"""
 # Squaring difference
@@ -416,6 +466,10 @@ uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
 # ╟─f71b0085-8185-4d3f-b29e-90af6ac8957a
 # ╠═2de65e70-661c-40c1-8fdb-03fd5b25b7e2
 # ╟─d5bff992-e8b2-4f72-8943-db8ac4a671eb
+# ╟─be7120b3-3dbe-4af7-b7b9-a4ede45f6cf3
+# ╠═c5c5ac69-6167-4078-8b8c-ac46a6d0be58
+# ╠═9f4d8332-5814-4625-9f5c-1056ee095428
+# ╟─35bcd481-acec-4c29-bfe6-732d3c4d09b0
 # ╟─be22832f-2004-49ec-911c-96e7e790ba5a
 # ╠═53b585dd-aa13-44c1-a3de-988e027ab0c4
 # ╟─b08055c9-b6de-4495-9788-ff79928a85ef