#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
void  fun(char* a, int  n)
{
    int i = 0, j = 0, m = 0,b=0,c=0;
    char* p;
    p = a;
    //第一步，判断字母前面有多少个*
    while (p[i++] == '*')
    {
        j++;
    }
    printf("字母前*的个数=%d\n",j);
    //求总的字符串长度
    while (a[m++] != '\0')
    {
        b++;
    }
    printf("字符串的总长度=%d\n", b);
    //是否满足n个
    //如果大于n，则删除多余的*
    //如果小于n，则不变
    if (n < j)
    {
        //把多余的*删除
        //多余的*有j-n个
        for (i = j - n; i < b; i++)
        {
            a[c++] = p[i];
        }
    }
    a[c] = '\0';
}

void main()
{
    char  s[81];  int  n; 
    printf("Enter a string:\n"); gets(s);
    printf("Enter n :  "); scanf("%d", &n);
    fun(s, n);
    printf("The string after deleted:\n"); puts(s);
}

输出结果：