Converts s to lowercase (by performing Unicode lowercase mapping) in place.
For a few characters string length may increase after the transformation,
in such a case the function reallocates exactly once.
If s does not have any uppercase characters, then s is unaltered.
Converts s to lowercase (by performing Unicode lowercase mapping) in place. For a few characters string length may increase after the transformation, in such a case the function reallocates exactly once. If s does not have any uppercase characters, then s is unaltered.