The amber source of that is [here](https://docs.amber-lang.com/basic_syntax/basic_syntax) and contains:

    // Define variables
    let name = "John"
    let age = 30
    
    // Display a greeting
    echo "Hello, my name is {name}"
    
    // Perform conditional checks
    if age < 18 {
        echo "I'm not an adult yet"
    } else {
        echo "I'm an adult"
    }

So there is no input, everything is known statically. No sanitation required. Any additional checks done by amber in the bash code is unnecessary.