Finally, I found out when the stripes candy will clear all candies horizontally or vertically. If the stripes on the candy is horizontal stripes, then this candy will clear candies horizontally. On the other hand, if the stripes on the candy is vertical stripes, then the candy will clear all candies vertically.
Also, to make horizontal stripes candies, you can match 4 of the same candies horizontally, and to make vertical stripes candies, match 4 of the same type candies vertically.
Have fun playing candy crush