Character List: A list of comma$-$separated, characters surrounded by square brackets $[].$ Recall, a character is denoted by single quotes surrounding it$.$ An optional single space character is allowed after the comma. The number of characters in the list is not specified, so an empty list $([])$ is allowed. The term comma$-$separated implies that a trailing comma $([\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'},])$ is not allowed. The single space character does not need to be consistent, so mixed spaces $([\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'}])$ is allowed $($this makes your solution a bit easier to implement$).$ Examples: $[\text{'}$a$\text{'}],[\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'}]$ Non$-$Examples: $\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'},[\text{'}$a$\text{'}\text{'}$b$\text{'}\text{'}$c$\text{'}]$