use std::path::Path;
pub fn get_lowercase_file_extension(file_path: &Path) -> Option<String> {
if let Some(ext) = file_path.extension().and_then(|e| e.to_str()) {
Some(String::from(ext).to_lowercase())
} else {
None
}
}
pub fn get_lowercase_file_name(file_path: &Path) -> Option<String> {
file_path.file_name().and_then(|s| s.to_str()).map(|s| s.to_lowercase())
}