hidden parameter exam exercise

subjects/hiddenp.md

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+# hiddenp
+## Instructions
+
+Write a program named hidenp that takes two strings and displays 1
+followed by a newline if the first string is hidden in the second one,
+otherwise displays 0 followed by a newline.
+
+Let s1 and s2 be strings. We say that s1 is hidden in s2 if it's possible to
+find each character from s1 in s2, in the same order as they appear in s1.
+Also, the empty string is hidden in any string.
+
+If the number of parameters is not 2, the program displays a newline.
+
+And its output :
+
+```console
+student@ubuntu:~/student/hiddenp$ go build
+student@ubuntu:~/student/hiddenp$ ./hiddenp "fgex.;" "tyf34gdgf;'ektufjhgdgex.;.;rtjynur6" | cat -e
+1$
+student@ubuntu:~/student/hiddenp$ ./hiddenp "abc" "2altrb53c.sse" | cat -e
+1$
+student@ubuntu:~/student/hiddenp$ ./hiddenp "abc" "btarc" | cat -e
+0$
+student@ubuntu:~/student/hiddenp$ ./hiddenp | cat -e
+$
+student@ubuntu:~/student/hiddenp$
+```