Function: diff
This tool belongs to the Gorilla file system. It is a simple file system that allows users to perform basic file operations such as navigating directories, creating files and directories, reading and writing to files, etc. Tool description: Compare two files of any extension line by line at the current directory.
Parameters: file_name1: type: string
description: The name of the first file in current directory.
file_name2: type: string
description: The name of the second file in current directorry. 
Required parameters: file_name1, file_name2
Response: diff_lines: type: string
description: The differences between the two files.