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 search_char("Hello", 'l')==True
  assert search_char("Hello", 'o')==True
  assert search_char("Hello", 'z')==False
  assert search_char("Hello", 'H')==True
  assert search_char("Hello", 'e')==True
output: def search_char(s, c):
      return c in s