solution

#!/bin/bash
set -e

# A POSIX variable
OPTIND=1  # Reset in case getopts has been used previously in the shell.

# Initialize our own variables:
ext="java"

function show_help() {
  echo "$(basename "$0") [-l] [-l java] The Problem Name
  It will
    1. Create directory of 'The-Problem-Name'
    2. Use default EDITOR to open 'The-Problem-Name/Solution.java' file
  where:
    -h  show this help text
    -l  set the language (default: java)"
}

while getopts "h?l:" opt; do
  case "$opt" in
    h|\?)
    show_help
    exit 0
    ;;
    l)  ext=$OPTARG
    ;;
  esac
done

shift $((OPTIND-1))

[ "$1" = "--" ] && shift

function join { local IFS="$1"; shift; echo "$*"; }

directory=$(join "-" "${@}")

if [ -z "${directory}" ]; then
  show_help
  exit 1
fi

mkdir "${directory}"
${EDITOR} "${directory}/Solution.${ext}"