granny square coin purse

i'm thinking of making one of these.
instead of buying it from here.

here's the pattern:
hook = I
yarn = worsted weight

RND 1: Chain 4, (work all of the following sts in the 4th ch from the hk)
2 dc, * ch 1, 3 dc, repeat from * twice more, ch 1. Join with sl st in top of beg ch 4.
Ch 3, turn the piece over.

RND 2: (2 dc, ch 2, 3 dc) in next ch 1 sp.* (3 dc, ch 2, 3 dc) in next ch 1 sp. Repeat from * twice more. Join with sl st in top of beg ch 3. Ch 3, turn the square over.

RND 3: 2 dc in next open space on the side of the square. (3 dc ch 2, 3 dc) in the next open space on the corner of the square. * 3 dc in next side space. (3 dc, ch 2, 3 dc) in next corner space. Repeat from * twice more. Join with sl st in top of beg ch 3. Ch 3, turn the square over.

FOR ANY ADDITIONAL ROWS:
Work 3 dc in each open space on the side of the square and work (3 dc, ch 2, 3 dc) in each corner space.
To begin a new row, always ch 3 and turn the square over.
To end each row, do a sl st in the top of the beg ch 3.

TO FINISH OFF: After doing the sl st to join the last row, ch 1 and pull the yarn all the way through the loop.

WEAVE IN ALL YARN ENDS.