Function rust_util::util_file::walk_dir

pub fn walk_dir<FError, FProcess, FFilter>(
    dir: &Path, 
    func_walk_error: &FError, 
    func_process_file: &FProcess, 
    func_filter_dir: &FFilter
) -> XResult<()> where
    FError: Fn(&Path, Box<dyn Error>),
    FProcess: Fn(&Path),
    FFilter: Fn(&Path) -> bool,