first commit

exercises/cards_of_suit.rb

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+#!/usr/bin/env ruby
+
+def cards_of_suit(cards, suit)
+  cards.select { |card| card.include?(suit) }
+end
+
+cards = [
+  "7 of hearts",
+  "king of clubs",
+  "10 of hearts",
+  "ace of spades"
+]
+
+puts cards_of_suit(cards, "hearts")