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.
  
  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", 'x')==False
output: def search_char(input_str, char):
    for c in input_str:
      if c == char:
        return True
    return False