Returns a sanitized folder path by removing a trailing slash unless the path is the root ("/").
The function trims whitespace from the input folder string. If the trimmed string equals "/", it is returned unchanged. Otherwise, any trailing slash is removed.
Parameters
folder: string
The folder path to sanitize.
Returns string
The folder path without a trailing slash, except for the root path.
Returns a sanitized folder path by removing a trailing slash unless the path is the root ("/").
The function trims whitespace from the input folder string. If the trimmed string equals "/", it is returned unchanged. Otherwise, any trailing slash is removed.