input: Write a function to search for a character in a given string. If the character is found, return True. Otherwise, return False. If the given string is empty, return False.
  def search_char(input_str, char):
    for c in input_str:
      if c == char:
        return True
    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(input_str, char):
    for c in input_str:
      if c == char:
        return True
    return False