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("Hello", 'o') == True
  assert search_char("Hello", 'z') == False
  assert search_char("", 'a') == False
output: def search_char(s, c):
      if not s:
          return False
      return c in s