strstr

strstr.rb

def strstr(subject, search)
  si = 0
  subject.length.times do |i|
    if subject[i] == search[si]
      if search.length == si + 1
        @found_at = i - si
        break
      end
      si += 1
    else
      si = 0
    end
  end
  puts @found_at
end

strstr("hello there", "her")