c语言输入一个字符串，输入整数m，从m处交换前后两段的位置，使用指针

#include<stdio.h>
#include<string.h>

void connect(char *st1, char *st2, char *q)
{
	for(;*st1!='\0';)
	{
		*q=*st1;
		st1++;
		q++;
	}	
	for(;*st2!='\0';)
	{
		*q=*st2;
		st2++;
		q++;
	}
	*q='\0';
}

int main()
{
	char soul[20];
	printf("请输入字符串: \n");
	gets(soul);
	int len,m;
	printf("请输入想要交换的位置m，（注意m须小于总字符串长度）: \n");
	scanf("%d",&m);
	len = strlen(soul);
	char *goal1 = new char[m+1];
	char *goal2 = new char[len-m+1];
	memcpy(goal2,&soul[m],len-m);
	memcpy(goal1,&soul[0],m);
	char c[30];
	char *p;
	p=c;
	connect(goal2,goal1, p);
	printf("%s\n",c); 
	delete []goal1;
	delete []goal2;
	delete []p;
	return 0;
}