How to Async Get Environment Variable in Tcl - Code Snippet

# Task: Async Get Environment Variable
# Language: Tcl

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