Reorganize helpers

src/lib/helpers/trim.sh

@@ -0,0 +1,13 @@
+# Trim leading and trailing whitespace.
+#
+# Example:
+#
+#   $ trim "  foo bar   "
+#   foo bar
+#
+trim() {
+  local string="$@"
+  string="${string#"${string%%[![:space:]]*}"}"
+  string="${string%"${string##*[![:space:]]}"}"
+  echo -n "$string"
+}