fixed pbm in extract_line : delete the line and the newline sequence character

+ fixed pbm n _cgi_pos : last return is npos, not pos

srcs/utils.cpp

@@ -198,8 +198,8 @@ std::string	str_tolower(std::string str)
 }
 
 // identify a line in a string, by delim (ex. '\n')
-// delete this line from the string
-// and return the deleted line
+// delete this line from the string (and the following nl sequence characters)
+// and return the deleted line (without the followinf nl sequence characters)
 std::string
 	extract_line(std::string & str, size_t pos, std::string delim)
 {
@@ -220,7 +220,7 @@ std::string
 		len = end - begin;
 
 	del_str = str.substr(begin, len);
-	str.erase(begin, len);
+	str.erase(begin, len +  delim.size());
 	return del_str;
 }