#include<stdio.h>
char *match( char *str, char *want );
int del_substr(char *str,char const *substr);

void main()
{
    char *a="abcdefg";
    char const *b="b";

    printf("%d\n",del_substr(a,b));
}

char *match( char *str, char *want )
{
    while( *want != '\0' )
        if( *str++ != *want++ )
            return NULL;
    return str;
}
int del_substr(char *str,char const *substr)
{
    char *next;

    while( *str != '\0' )
    {
        next = match( str, substr );//发现一样的字符，就返回这个字符在str中的下一个位置给next
        if( next != NULL )
            break;
        str++;                                 
    }

    if( *str == '\0')
        return 0;

    while( *str++ = *next++ ) //那么这里的next和str应该是一样的值啊，真心的没看懂！期待给个详细的解释，谢谢了
        ;
    return 1;
}