伪代码：
For each string in the array: Find the first '{'. If there is none, leave that string alone. Init a counter to 0. For each character in the string: If you see a '{', increment the counter. If you see a '}', decrement the counter. If the counter reaches 0, break. Here, if your counter is not 0, you have invalid input (unbalanced brackets) If it is, then take the string from the first '{' up to the '}' that put the counter at 0, and that is a new element in your array.
