编写一个函数。其参数为一个字符串，函数删除字符串中的空格。在一个可以循环读取的程序中进行测试，直到用户输入空行。对于任何输入字符串，函数都应该适用并可以显示结果。-Write a function. Its argument is a string function to remove spaces in the string. In the test program a loop to read until the user enters a blank line. For any input string, the function should be applicable and can display the results.