new tasks

Task/Binary_strings/Ruby/binary_strings.rb

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+# string creation
+x = "hello world"
+
+# string destruction
+x = nil
+
+# string assignment with a null byte
+x = "a\0b"
+x.length  # ==> 3
+
+# string comparison
+if x == "hello"
+  puts equal
+else
+  puts "not equal"
+end
+y = 'bc'
+if x < y
+  puts "#{x} is lexicographically less than #{y}"
+end
+
+# string cloning
+xx = x.dup
+x == xx       # true, same length and content
+x.equal?(xx)  # false, different objects
+
+# check if empty
+if x.empty?
+  puts "is empty"
+end
+
+# append a byte
+x << "\07"
+
+# substring
+xx = x[0..-2]
+
+# replace bytes
+y = "hello world".tr("l", "L")
+
+# join strings
+a = "hel"
+b = "lo w"
+c = "orld"
+d = a + b + c