Function read_input_with_io 

pub fn read_input_with_io<R: InputReader, W: OutputWriter>(
    prompt: &str,
    default_value: Option<&str>,
    trim_whitespace: bool,
    show_prompt: bool,
    reader: &mut R,
    writer: &mut W,
) -> Result<String, InputError>

Internal helper function to read input with various options This version accepts generic reader/writer for testing

Arguments

• prompt - The prompt text to display
• default_value - Optional default value to return if input is empty
• trim_whitespace - Whether to trim leading/trailing whitespace
• show_prompt - Whether to display the prompt
• reader - Input reader implementation
• writer - Output writer implementation