Family Day update

Task/Synchronous-concurrency/Crystal/synchronous-concurrency.crystal

@@ -0,0 +1,16 @@
+File.write("input.txt", "a\nb\nc")
+
+lines = Channel(String).new
+
+spawn do
+  File.each_line("input.txt") do |line|
+    lines.send(line)
+  end
+  lines.close
+end
+
+while line = lines.receive?
+  puts line
+end
+
+File.delete("input.txt")