class String
def pop
return nil if self.empty?
item=self[-1]
self.chop!
return nil if item.nil?
item.chr
end
def unshift(other)
newself = other.to_s.dup.pop.to_s + self
self.replace(newself)
end
end
a = "this is a test"
puts (a.unshift "asfd")