input: Write a function in Python to search for a character in a given string. If the character is found in the string, the function should return True; otherwise, 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
  assert search_char("Python", 'P')==True
output: def search_char(s, c):
      return c in s