[笔试面试][code_by_hand]压缩字符串

压缩字符串，input:aaabbbccc output:3a3b3c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char* compress(const char * src, char *des)
{
        if (des==NULL)
        {
                return NULL;
        }
        int count = 1;
        int pointer = 0;
        char current = src[0];
        int i;
        for (i=1; i<strlen(src); i++)
        {
                if (src[i]==current)
                {
                        count++;
                }else{
                        pointer += sprintf(&des[pointer], "%d", count);
                        des[pointer++] = current;
                        count = 1;
                        current = src[i];
                }
        }
        pointer += sprintf(&des[pointer], "%d", count);
        des[pointer++] = current;
        des[pointer] = '\0';
        return des;
}

int main()
{
        char arr[100];
        char brr[201];
        while(1)
        {
                scanf("%s", arr);
                printf("%s\n", compress(arr, brr));
        }
        return 0;
}