Function srfnrm_c 

pub unsafe extern "C" fn srfnrm_c(
    method: *const c_char,
    target: *const c_char,
    et: SpiceDouble,
    fixref: *const c_char,
    npts: SpiceInt,
    srfpts: *mut [ConstSpiceDouble; 3],
    normls: *mut [SpiceDouble; 3],
)