去掉字符串多余的空格

#include<iostream>
using namespace std;


char *deblank(char *arr)
{
	if(arr == NULL)
		return  NULL;

	char *slow = arr;
	char *fast = arr;

	while(*fast == ' ' && *fast != '\0')
	{
		fast++;
	}

	while(*fast != '\0')
	{
		if(*fast != ' ' )
		{
			*slow++ = *fast++;
		}
		else
		{
			*slow++ =  ' ';
			*fast++;
			while(*fast == ' '  && *fast != '\0')
			{
				fast++;
			}

		}
		
	}

	*slow  = '\0';
	return  arr; 
}

int main() 
{
	char arr[] = "   I     like   you  !";
	printf("删除多余的空格前：\n%s\n", arr);

	//char *p;
	deblank(arr);
	printf("删除多余的空格后：\n%s\n", arr);
	return 0;
}