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