add replace

src/parser.v

@@ -1,7 +1,15 @@
+fn replace(text string, start int, len int, repl string) string {
+	return text[..start] + repl + text[start + len..]
+}
+
 fn parse(lines []string) string {
-	mut output := ''
-	for _, line in lines {
-		output += line + '\n'
+	mut output := '<p>'
+	for line in lines {
+		if idx := line.index('2') {
+			output += replace(line, idx, 1, 'foferk') + '<br>\n'
+		}
+		output += line + '<br>\n'
 	}
+	output += '</p>'
 	return output
 }