normalize.rs

if !pathNfilename_abs.is_null() {                  
    let path = std::path::Path::new(               
        std::ffi::CStr::from_ptr(pathNfilename_abs)
            .to_str()                              
            .unwrap(),                             
    );                                             
    match fs::canonicalize(path) {                 
        Ok(v) => {                                 
            return to_cstring(v.to_str().unwrap());
        }                                          
        Err(e) => return 0 as *mut libc::c_char,   
    }                                              
} else {                                           
    pathNfilename_abs                              
}