The CalculateTolerances function calculates upper and lower bounds based on a wanted file size and tolerance size in bytes.

The function `ConvertStringSizeToBytes` converts a string representation of size with units to bytes.

The function `GetOperatorSizeMatches` determines if a file size matches a specified operator, wanted file size, and tolerance size.

InRange checks if a target string matches any string in the options slice.

The function `IsDirectoryEmpty` checks if a directory is empty by listing its entries.

The IsExtensionValid function checks if a given file extension is valid for a specified file type based on a predefined list of allowed extensions.

The function `RemoveEmptyDir` checks if a directory is empty and removes it if it is.

The function `ToFileType` converts a string representation of a file type to a corresponding enum value from the `types.FileType` enum.

The function `ToOperatorType` converts a string representation of an operator type to its corresponding enum value.

Validate function using reflection.