Fix header and newline parsing

src/parser.v

@@ -8,10 +8,10 @@ fn parse_header(line string) (int, string) {
 	}
 
 	mut lvl := 0
-	for line[lvl] == '!'[0] { // Jestem geniuszem programowania
+	for lvl < line.len && line[lvl] == '!'.bytes()[0] {
 		lvl++
 	}
-	if line[lvl + 1] != ' '[0] { // String to u8 converter xd
+	if lvl == 0 || lvl >= line.len || line[lvl] != ' '.bytes()[0] {
 		return 0, line
 	}
 	return lvl, line[lvl + 1..]
@@ -20,21 +20,35 @@ fn parse_header(line string) (int, string) {
 fn parse(lines []string) string {
 	mut output := '<p>'
 	for line in lines {
-		lvl, text := parse_header(line)
+		mut trimmed := line.trim_space()
+
+		if trimmed.len == 0 {
+			output += '<br>\n'
+			continue
+		}
+
+		lvl, mut text := parse_header(trimmed)
+
 		if lvl > 0 {
 			output += '<h' + lvl.str() + '>'
 		}
 
 		if idx := text.index('2') {
-			output += replace(text, idx, 1, 'foferk') + '<br>\n'
+			text = replace(text, idx, 1, 'foferk')
 		}
 
 		if lvl > 0 {
-			output += '</h' + lvl.str() + '>'
+			output += text + '</h' + lvl.str() + '>'
+		} else {
+			output += text
 		}
 
-		output += text + '<br>\n'
+		if lvl == 0 {
+			output += '<br>'
 		}
+		output += '\n'
+	}
+
 	output += '</p>'
 	return output
 }