Merge pull request #2229 from niuli1991/master-1047

添加1047.删除字符串中的所有相邻重复项 Ruby实现

problems/1047.删除字符串中的所有相邻重复项.md

@@ -475,6 +475,26 @@ impl Solution {
 }
 ```
 
+### Ruby
+
+```ruby
+def remove_duplicates(s)
+  #数组模拟栈
+  stack = []
+  s.each_char do |chr|
+    if stack.empty?
+      stack.push chr
+    else
+      head = stack.pop 
+      #重新进栈
+      stack.push head, chr if head != chr
+    end
+  end
+
+  return stack.join
+end
+```
+
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