M bin/c+ → bin/c+

@@ -1,3 +1,7 @@ 
 #!/bin/sh
 
-sed s'/^'/'\/\/'//+symbol="$1"
+
+[ ! "$symbol" ] && symbol='// '
+
+sed "s!^!$symbol!"

M bin/c- → bin/c-

@@ -1,3 +1,8 @@ 
 #!/bin/sh
 
-sed s@^['	'' ']*//@@+symbol="$1"
+
+[ ! "$symbol" ] && symbol="// "
+
+
+sed "s!^$symbol*!!"