Function subpnt_c 

pub unsafe extern "C" fn subpnt_c(
    method: *const c_char,
    target: *const c_char,
    et: SpiceDouble,
    fixref: *const c_char,
    abcorr: *const c_char,
    obsrvr: *const c_char,
    spoint: *mut SpiceDouble,
    trgepc: *mut SpiceDouble,
    srfvec: *mut SpiceDouble,
)