Simplify kotlin code and improve code readability (#1198)
* Add kotlin code block for chapter_hashing
* Add kotlin code block for chapter_heap.
* Add kotlin code block for chapter_stack_and_queue and chapter_tree
* fix indentation
* Update binary_tree.md
* style(kotlin): simplify code and improve readability.
* simplify kt code for chapter_computational_complexity.
* style(kotlin): replace ArrayList with MutableList.
* Update subset_sum_i.kt
Use kotlin api instead of java.
* Update subset_sum_ii.kt
use kotlin api instead of java
* style(kotlin): replace ArrayList with mutablelist.
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Co-authored-by: Yudong Jin <krahets@163.com>
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