请实现—个函数，把字符串s中的每个空格替换成”%20""。

示例1:

输入:s = "we are happy ."输出:""Me%20are%20happy ."

#define _CRT_SECURE_NO_WARNINGS //vs2017下使用strcpy
#include <iostream>
#include <string>#include <stdio.h>using namespace std;void replaceSpace(string& tempStr)
{char tempBuf[100] = { 0 };strcpy(tempBuf, tempStr.c_str());cout << tempBuf << endl;tempStr.clear();for (int i = 0; i < strlen(tempBuf); ++i){if (tempBuf[i] == ' '){tempStr.append("%20");}else{tempStr.push_back(tempBuf[i]);}}
}int main()
{string tempStr = "we are happy";replaceSpace(tempStr);cout << tempStr << endl;
}