Removed three redundant .c_str() calls (#857)
Removed three redundant .c_str() calls (#857)

* Removed three redundant .c_str() calls

* One hack workaround

Hack workaround: presult.append(st); -> presult.append(st, 0, i);
hunspell/hunspell,hunspell/hunspell,hunspell/hunspell,hunspell/hunspell