enclose macro arguments in parenthesis

fix over-optimization of strstr

fix missing zero-termination in strreplace

add zero-termination guarantees

do not use c++ object initialization

use EXPECT_STREQ instead of strcmp

add tests for strupper and strlower

add test coverage for _m variant functions

disallow NULL for cx_str() and cx_mutstr()

add tests and missing implementations for strings

(0) -300 -100 -10 +10 +100 +300 tip

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