## String Templates (#3)

Write a function `show()` with parameters `i: Int`, `s: String`, `c: Char` and
`d: Double`. On the console, `show()` displays the value of each parameter on
its own line: first the name of the identifier, then a colon and a space, and
then the value of that identifier. Surround the `String` value with double quotes
and the `Char` value with single quotes.

Sample output:

```
i: 10
s: "abc"
c: 'a'
d: 1.0
```