diff --git a/src/main.rs b/src/main.rs
index 7c990d1..50d60d7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -115,13 +115,13 @@ fn parse_file(file: impl io::Read) -> Result<json::JsonValue, Box<std::error::Er
 		// ignore empty lines
 		let line_str = String::from(line.unwrap().trim());
 		let line_s = &line_str;
-		if 0 == line_s.len() {
+		if line_s.is_empty() {
 			continue;
 		}
 		// find keywords
 		match patterns
 			.iter()
-			.find(|&&pattern| line_s.starts_with(pattern) && line_s.ends_with(":"))
+			.find(|&&pattern| line_s.starts_with(pattern) && line_s.ends_with(':'))
 		{
 			Some(pattern) => {
 				use KeywordType::*;
@@ -129,14 +129,11 @@ fn parse_file(file: impl io::Read) -> Result<json::JsonValue, Box<std::error::Er
 				ctx.last_keyword_type = ctx.cur_keyword_type;
 				ctx.last_tag = ctx.cur_tag.clone();
 				ctx.cur_keyword_type = Some(keyword_type(&pattern));
-				ctx.cur_tag = pattern.replace(" ", "").replace(":", "");
+				ctx.cur_tag = pattern.replace(' ', "").replace(':', "");
 
 				// remember question id
-				match ctx.cur_keyword_type {
-					Some(QuestionStart) => {
-						ctx.cur_question_pre["id"] = line_s.replace(":", "").as_str().into();
-					}
-					_ => (),
+				if let Some(QuestionStart) = ctx.cur_keyword_type {
+					ctx.cur_question_pre["id"] = line_s.replace(':', "").as_str().into();
 				};
 
 				// apply accumulated content when new keyword found
@@ -222,9 +219,6 @@ fn main() -> Result<(), Box<std::error::Error>> {
 		let mut outfile = fs::File::create(outfilename)?;
 
 		data.write_pretty(&mut outfile, 1)?;
-		//data.write(&mut outfile)?;
-		//debug
-		break;
 	}
 	Ok(())
 }