[feat] Morse code decoder has been done

decoder.rb

@@ -0,0 +1,80 @@
+#!/usr/bin/env ruby
+
+morse = {
+  "A" => ".−",
+  "B" => "−...",
+  "C" => "−.−.",
+  "D" => "−..",
+  "E" => ".",
+  "F" => "..−.",
+  "G" => "−−.",
+  "H" => "....",
+  "I" => "..",
+  "J" => ".−−−",
+  "K" => "−.−",
+  "L" => ".−..",
+  "M" => "−−",
+  "N" => "−.",
+  "O" => "−−−",
+  "P" => ".−−.",
+  "Q" => "−−.−",
+  "R" => ".−.",
+  "S" => "...",
+  "T" => "−",
+  "U" => "..−",
+  "V" => "...−",
+  "W" => ".−−",
+  "X" => "−..−",
+  "Y" => "−.−−",
+  "Z" => "−−..",
+  "1" => ".−−−−",
+  "2" => "..−−−",
+  "3" => "...−−",
+  "4" => "....−",
+  "5" => ".....",
+  "6" => "−....",
+  "7" => "−−...",
+  "8" => "−−−..",
+  "9" => "−−−−.",
+  "0" => "−−−−−",
+  " " => " ",
+  "." => ".−.−.−",
+  "," => "−−..−−",
+  "?" => "..−−..",
+  "'" => ".−−−−.",
+  "!" => "−.−.−−",
+  "/" => "−..−.",
+  "(" => "−.−−.",
+  ")" => "−.−−.−",
+  "&" => ".−...",
+  ":" => "−−−...",
+  ";" => "−.−.−.",
+  "=" => "−...−",
+  "+" => ".−.−.",
+  "-" => "−....−",
+  "_" => "..−−.−",
+  "\"" => ".−..−.",
+  "$" => "...−",
+}
+
+answer = ARGV.first
+
+message = STDIN.gets.chomp.upcase
+
+if answer == "-e"
+  output = message.split("").map do |letter|
+    morse[letter] + " "
+  end.join("")
+  puts output
+elsif answer == "-d"
+  output = message.split(" ").map do |word|
+    morse.key(word)
+  end.join("")
+  puts output
+else
+  STDERR.puts "-manual-"
+  STDERR.puts "encode: -e"
+  STDERR.puts "decode: -d"
+  STDERR.puts "example: echo \"hello\" | ruby program.rb -e"
+end
+