Function ucl_parser_add_string 

pub unsafe extern "C" fn ucl_parser_add_string(
    parser: *mut ucl_parser,
    data: *const c_char,
    len: usize,
) -> bool

Load ucl object from a string @param parser parser structure @param data the pointer to the string @param len the length of the string, if len is 0 then data must be zero-terminated string @return true if string has been added and false in case of error