Function lgraph_api_vertex_iterator_get_field_by_name 

pub unsafe extern "C" fn lgraph_api_vertex_iterator_get_field_by_name(
    it: *mut lgraph_api_vertex_iterator_t,
    field_name: *const c_char,
    errptr: *mut *mut c_char,
) -> *mut lgraph_api_field_data_t