My strcat's problem

[leekic]

This is a strcat code I wrote,has a problem,please help me,please.Thanks

#include<stdio.h>
#include<assert.h>

char *mystrcat(char *dest,char *src)
{
	assert(dest!=NULL&&src!=NULL);
    dest+=strlen(dest);
    while(*dest++==*src++);
    return dest;
}
main()
{
	char str[50]="hello,world";
	char str2[10]="world";
	printf("%s\n",mystrcat(str,str2));
}

[Rubberman]

Is this a class exercise/problem? In any case, you don't specify what the problem is. In any case, you have at least one problem:

You are comparing, not assigning the contents of src to dest.