Remove useless files, update subject

go/tofix/cat/correct/quest8.txt

@@ -1 +0,0 @@
-"Programming is a skill best acquired by practice and example rather than from books" by Alan Turing

go/tofix/cat/correct/quest8T.txt

@@ -1 +0,0 @@
-"Alan Mathison Turing was an English mathematician, computer scientist, logician, cryptanalyst. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. Turing is widely considered to be the father of theoretical computer science and artificial intelligence."

subjects/cat.en.md

@@ -2,32 +2,24 @@
 
 ### Instructions
 
-Write a program that has the same behaviour as the system's `cat` command-line.
+Write a program that behaves like a simplified `cat` command.
 
-- The `options` do not have to be handled.
+- The options do not have to be handled.
 
-- If the program is called without arguments it should take the `input` and print it back (as shown with the "Hello" example below).
-
-- In the program folder create two files named `quest8.txt` and `quest8T.txt`.
-
-- Copy to the `quest8.txt` file the following sentence :
-
-`"Programming is a skill best acquired by practice and example rather than from books" by Alan Turing`
-
-- Copy to the `quest8T.txt` file the following sentence :
-
-`"Alan Mathison Turing was an English mathematician, computer scientist, logician, cryptanalyst. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. Turing is widely considered to be the father of theoretical computer science and artificial intelligence."`
-
-- In case of error the program should print the error.
-
-- The program must be submitted inside a folder named `cat`.
+- If the program is called without arguments it should take the standard input (stdin) and print it back (as shown with the "Hello" example below).
 
 ```console
+student@ubuntu:~/[[ROOT]]/cat$ echo '"Programming is a skill best acquired by practice and example rather than from books" by Alan Turing' > quest8.txt
+student@ubuntu:~/[[ROOT]]/cat$ cat <<EOF> quest8T.txt
+"Alan Mathison Turing was an English mathematician, computer scientist, logician, cryptanalyst. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. Turing is widely considered to be the father of theoretical computer science and artificial intelligence."
+EOF
 student@ubuntu:~/[[ROOT]]/cat$ go build
 student@ubuntu:~/[[ROOT]]/cat$ ./cat abc
-open abc: no such file or directory
+ERROR: abc: No such file or directory
 student@ubuntu:~/[[ROOT]]/cat$ ./cat quest8.txt
 "Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing
+student@ubuntu:~/[[ROOT]]/cat$ cat quest8.txt | ./cat
+"Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing
 student@ubuntu:~/[[ROOT]]/cat$ ./cat
 Hello
 Hello