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 is empty then return False.
  assert serach_char("Hello", 'l')==True
  assert serach_char("Hello", 'o')==True
  assert serach_char("Hello", 'z')==False
  assert serach_char("", 'l')==False
output: def serach_char(s, char):
      if not s:
          return False
      return char in s