Reverses all of the bytes in a string. For example,
g_strreverse ("abcdef") will result in “fedcba”.
g_strreverse() doesn’t work on UTF-8 strings
containing multibyte characters. For that purpose, use g_utf8_strreverse().
The string to reverse.
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.