The original code in function 'read_punct' relies on heavy string
specific function calls, resulting in slower execution. Instead, this
function can be faster using straightforward control flow.

See fuhsnn#92

Speed up recognize punctuation

Previously, HashMap relied on division operations, which are expensive.
This update replaces divisions with logical AND operations using an
additional mask, improving performance.

Avoid expensive division in HashMap

In 'preprocess2' function, 'expand_macro' was called multiple times,
some of which were unnecessary. This change ensures that 'expand_macro'
is called only when the preprocessor token is an identifier.

Co-authored-by:  Jim Huang <[email protected]>