$10.$ Take in a string from the user and split it into an array of single characters. Split the list of characters into a list of lists where each inner list has $3$ elements. Notice that the last inner array may have less than $3$ elements. Enter a string: hello world $[[\text{'}$h$\text{'},\text{'}$e$\text{'},\text{'}$l$\text{'}],[\text{'}$l$\text{'},\text{'}$o$\text{'},$ I $\text{'}],[\text{'}$w$\text{'},\text{'}$o$\text{'},\text{'}$r$\text{'}],[\text{'}$l$\text{'},\text{'}$d$\text{'}]]$