Add source to character 'l'
	modified:   cpp/leetcode.com/implement_strstr.h
	modified:   cpp/leetcode.com/interleaving_sring.h
	new file:   cpp/leetcode.com/jump_game.h
	new file:   cpp/leetcode.com/jump_game2.h
	new file:   cpp/leetcode.com/largest_rectangle_in_histogram.h
	new file:   cpp/leetcode.com/length_of_last_word.h
	new file:   cpp/leetcode.com/letter_combinations_of_a_phone_number.h
	new file:   cpp/leetcode.com/longest_common_prefix.h
	new file:   cpp/leetcode.com/longest_palindromic_substring.h
	new file:   cpp/leetcode.com/longest_substring_without_repeating_characters.h
	new file:   cpp/leetcode.com/longest_valid_parentheses.h