Problem with C stub in contributions

[eulerscheZahl]

read c:string(1) gets translated to char c[2]; fgets(c, 2, stdin);
But it should be char c[3]; fgets(c, 3, stdin); as you read the actual text, the linebreak and the \0 to terminate the string.
You can verify it like this: for (int i = 0; i < 3; i++) printf("%d ", c[i]); // print 100 10 0 (with 100='d')

I remember @Niako reporting that about a year ago. It also caused some hiccups in the last contest, see stub.txt.

edit: Link to Niako’s post

Credit Card Verifier (Luhn’s algorithm)

Nope, you need one extra char for the \n (newline) plus one extra char for the \0 that indicates the end of the string (in C there is no string object, you use large enough char[MaxSize] instead, hence the length of a string is not explicitly specified and you need one way to mark the end, which is done by a \0 char). Edit: I fixed the default code generator for this puzzle.