Function SCIPcreateDatatreeInTree 

pub unsafe extern "C" fn SCIPcreateDatatreeInTree(
    scip: *mut SCIP,
    datatree: *mut SCIP_DATATREE,
    newtree: *mut *mut SCIP_DATATREE,
    name: *const c_char,
    capacity: c_int,
) -> SCIP_RETCODE

creates a new SCIP_DATATREE and inserts it into a SCIP_DATATREE object