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.
  
  assert serach_char("Hello", 'l')==True
  assert serach_char("World", 'a')==False
  assert serach_char("Python", 'n')==True
  assert serach_char("Java", 'v')==True
  assert serach_char("", 'a')==False
output: def search_char(s, c):
      return c in s