input: Write a function to find certain substrings within a larger string.
  assert find_substrings(['language'],'python language')==('Matched!')
  assert find_substrings(['program'],'python language')==('Not Matched!')
  assert find_substrings(['python'],'programming language')==('Not Matched!')
output: def find_substrings(substrings, main_string):
      for substring in substrings:
          if substring in main_string:
              return 'Matched!'
      return 'Not Matched!'