ft_memchr new test value

[DCAndrei]

Hello,

I had a new experience with Moulinette, i wrong cast both the void * ( void *to char *) and the int ( int to unsigned int) in the function, yet the all the tests passed, but moulinette failed me. I suggest if possible to add a test for the memory value "ÿÿÿ1" and the char value 191, for this values my function failed.
I am sorry to bother, but i thought it will help other beginners like me, i did everything but i missed this one...

Thanks again