lzutao b790439e28 Cast arguments to ut8 when feeding ctype.h functions ##refactor
The behavior of the `<ctype.h>` functions is undefined for negative
arguments (other than `EOF`). In such a situation, the argument should
be cast to `unsiged char` for safety.

References:
 - C Programming: A Modern Approach, 2nd Edition: page 612, chapter 23.5
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