input: Write a function to search for a character in a given string. If the character is found in the string return True else return False. If the given string or character is empty then return False.
  assert search_char("Hello", 'l')==True
  assert search_char("Hello", 'z')==False
  assert search_char("Hello", '')==False
  assert search_char("", 'l')==False
  assert search_char("", '')==False
output: def search_char(s, c):
      if not s or not c:
          return False
      return c in s