[DEBUG] in case of unknown conversion specifier

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
[BUG] st_scanf wasnt comparing [...]and (...) if there was no + after
Signed-off-by: etienne basset <etienne.basset@numericable.fr>
[DEBUG] update debug values

Signed-off-by: etienne basset <etienne.basset@numericable.fr>