下面这个程序是要在一个字符串内容中删除某些字符串。
算法：逐个字符比较，若不相等就保留，相等就删除。
出现问题：总是输入什么，输出就是什么，根本没有实现删除的功能，但我实在找不出哪里错了
#include<iostream>
using namespace std;
#define MAX 256
int delstring(char **target,char *source);
int main()
{
    char *p_target=0;
    char *p_source=0;
    int k;
    p_target=new char[MAX];
    p_source=new char[MAX];
    cout<<"请输入目标串："<<endl;
    cin>>p_target;
    cout<<"请输入删除项："<<endl;
    cin>>p_source;
    cout<<"在"<<p_target<<"内删除"<<p_source<<endl;
    if(strlen(p_target)<strlen(p_source))
    {
        cout<<"目标长度小于替换长度！"<<endl;
    }
    else
    {
        k=delstring(&p_target,p_source);
        if(k>0)
        {
            cout<<p_target<<endl;
        }
        else
        {
            cout<<"没找到"<<endl;
        }
    }
        delete[] p_target;
        delete[] p_source;
        p_target=0;
        p_source=0;
        return 0;
}
int delstring(char **target,char *source)
{
    char *p_target=*target;
    char *p_source=source;
    char *p_temp=0;
    char *p_next=0;
    int pos=0;
    p_temp=new char[strlen(*target)];
    p_next=p_temp;
    while(strlen(p_source)<=strlen(p_target))
    {
        if(*p_source==*p_target)
        {
            for(pos=0;pos<strlen(source);pos++)
            {
                if(*(p_target+pos)!=*p_source)
                {
                    break;
                }
                p_source++;
            }
            if(pos<strlen(source))
            {
                for(int i=0;i<pos;i++)
                {
                    *p_next=*(p_target+i);
                    p_next++;
                }
            }
            else
            {
                target+=pos;
                p_temp=*target;
                p_source=source;
            }
        }
        else
        {
            *p_next=*p_target;
            p_next++;
            p_target++;
        }
    }
    while(*p_target!='\0')
    {
        *p_next=*p_target;
        p_next++;
        p_target++;
    }
    *target=strcat(p_next,p_temp);
    return 1;
}