markdown
kotlin:ank -> executes the snippet
    kotlin:ank:silent -> does not display the output of the snippet
    kotlin:ank:replace -> replaces the current snippet with its output
    kotlin:ank:fail -> this snippet will pass the gradle task and the stacktrace is displayable
    kotlin:ank:playground ->(
        with //sampleStart and //sampleEnd one specifies the displayable field.
        The rest can be expanded by the viewer:
    ).`example`{
    ```kotlin:ank:playground
        //sampleStart
        fun helloWorld(): String = "Hello World"
        //sampleEnd
        fun main() {
            println(helloWorld())
        }