修改0112.路径总和.md的Java版本代码的字母小写问题、修改0530.二叉搜索树的最小绝对差.md的Java版本 进行了代码格式化并添加了统一迭代法的注释 #2874
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修正了0112.路径总和.md的Java版本代码的以下问题
1、变量命名不符合驼峰命名
2、Solution、Stack、Integer等也异常小写