input: Write a function that searches for a character in a given string. If the character is found in the string, return True; otherwise, return False.
  
  
  def search_char(input_str, char):
      return char in input_str
  
  assert search_char("Hello", 'l') == True
  assert search_char("Hello", 'o') == True
  assert search_char("Hello", 'x') == False
  assert search_char("Hello", 'H') == True
  assert search_char("", 'a') == False
  
output: def search_char(input_str, char):
      return char in input_str