diff --git a/sh/core/code.awk b/sh/core/code.awk
index 10ca584..44890b5 100644
--- a/sh/core/code.awk
+++ b/sh/core/code.awk
@@ -36,37 +36,44 @@ function doc_reset() {
 function extract(string, type) {
 	if (type == "alias") {
 		split(string, array, "#=")
-		return trim(array[2])
+		return strip(array[2])
 	} else if (type == "command") {
 		split(string, array, "#/")
-		return trim(array[2])
+		return strip(array[2])
 	} else if (type == "doc") {
 		split(string, array, "#")
-		return trim(array[2])
+		return strip(array[2])
 	} else if (type == "function") {
 		split(string, array, "(")
-		return trim(array[1])
+		return strip(array[1])
 	} else if (type == "module") {
 		split(string, array, "#\\.")
-		return trim(array[2])
+		return strip(array[2])
 	} else if (type == "shebang") {
 		split(string, array, "#!")
-		return trim(array[2])
+		return strip(array[2])
 	} else if ((type == "constant") || (type == "variable")) {
 		split(string, array, "=")
-		return trim(array[1])
+		return strip(array[1])
 	}
 }
 
+function strip(string, tmp) {
+	tmp = string
+	sub("^[\t ]*", "", tmp)
+	sub("[\t ]*$", "", tmp)
+	return tmp
+}
+
 function strip_first(string, sep, tmp) {
 	tmp = string
 	sub(sep, "", tmp)
-	return trim(tmp)
+	return strip(tmp)
 }
 
 function strip_from(string, sep, tmp) {
 	split(string, tmp, sep)
-	return trim(tmp[1])
+	return strip(tmp[1])
 }
 
 function strip_function(string, tmp) {
@@ -77,13 +84,6 @@ function strip_value(string, tmp) {
 	return strip_from(string, "=")
 }
 
-function trim(string) {
-	text = string
-	sub("^[\t ]*", "", text)
-	sub("[\t ]*$", "", text)
-	return text
-}
-
 # → begin
 BEGIN {