Function islet_parse 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn islet_parse(
    title: *const c_char,
    claims: *const c_uchar,
    claims_len: c_int,
    value_out: *mut c_uchar,
    value_out_len: *mut c_int,
) -> islet_status_t

Parse the claims with the given title and returns the claim if succeeded.