Function SCIPinsertDatatreeString 

pub unsafe extern "C" fn SCIPinsertDatatreeString(
    scip: *mut SCIP,
    datatree: *mut SCIP_DATATREE,
    name: *const c_char,
    value: *const c_char,
) -> SCIP_RETCODE

inserts a string value into a SCIP_DATATREE object

The string value will be copied.