[leetcode] sword finger offer 58 - ii Rotate string left

The left rotation operation of string is to transfer several characters in front of string to the end of string . Please define a function to implement the left rotation operation of string . such as , Input string "abcdefg" And number 2, This function will return the result of rotating two bits to the left "cdefgab".

Example 1：

Input : s = “abcdefg”, k = 2
Output : “cdefgab”

Example 2：

Input : s = “lrloseumgh”, k = 6
Output : “umghlrlose”

Limit ：

1 <= k < s.length <= 10000

	/** *  The finger of the sword  Offer 58 - II.  Left rotation string  */
    public String reverseLeftWords(String s, int n) {
    
        return s.substring(0, n) + s.substring(n);
    }

source ： Power button （LeetCode）
link ：https://leetcode.cn/problems/zuo-xuan-zhuan-zi-fu-chuan-lcof