Function validate_command 

pub fn validate_command(command: &str) -> Result<String, String>

Validate command to prevent dangerous operations and command injection

Checks

• Rejects known dangerous commands from DANGEROUS_COMMANDS list
• Rejects piping to bash/sh shells
• Rejects command substitution attempts ($(...) or backticks)
• Rejects command chaining (&&)
• Rejects eval command

Arguments

• command - The command string to validate

Returns

• Ok(command) - The validated command if all checks pass
• Err(reason) - A string describing why the command was rejected