How to Async Get File Extension in Tcl - Code Snippet

# Task: Async Get File Extension
# Language: Tcl

proc async_get_file_extension() {
    # Implementation for Async Get File Extension
    set result = ...; # Initialize variable
    # TODO: Implement core logic here
    # Step 1: Prepare data
    # Step 2: Process Async Get File Extension
    puts("Done");
}