Week 3 - 2e - Inserted Word

gistfile1.rb

def find_and_replace_files_existing_string_with_new_string(filename, old_string, new_string)
  original_file_content = File.read("#{filename}")
  new_file_content = original_file_content.gsub(old_string, new_string)
  File.write("#{filename}", new_file_content)
end

=begin
Here is the existing sample file entitled 'plain_text.txt':

text text text text text
text text text text text
text text word text text
text text text text text
text text text text text

=end

find_and_replace_files_existing_string_with_new_string('plain_text.txt','word', 'inserted word')