Function prototypes

Hi, this is my first post on this site, so hopefully this is correct way of doing things.
I have started typing a piece of code that allows input of two strings that will be placed together. However i have come across this error : "'mystrcat' : cannot convert parameter 1 from 'char [80]' to 'char'" and cant figure out how to correct it.
Any help appreciated.

Code:

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#include "stdafx.h"
#include "ctype.h"
#include "string.h"

char mystrcat(char, char);

int main()
{
        char string1[80], string2[80];
        for (;;)
        {
                printf("Enter string1: ");
                scanf("%s", &string1);
                if (!strcmp(string1, "done"))
                        break;
                printf("Enter string2: ");
                scanf("%s", &string2);
                printf("String1: %s String2: %s\n", string1, string2);
                printf("Returned string : %s\n", mystrcat(string1, string2));
                printf("String1: %s String2: %s\n", string1, string2);
        }
}

char *mystrcat(char *s, char *p)
        {
        size_t i,j;
    for (i = 0; s[i] != '\0'; i++);
    for (j = 0; p[j] != '\0'; j++)
        s[i+j] = p[j];
    s[i+j] = '\0';
    return s;
        }

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In your function prototype, you say you will be passing a char and a char. But, you really want to pass a char pointer and a char pointer.

Try this:

Code:

---

char mystrcat(char *, char *);

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thank you!
looking at it now, i can see it plain and simple.
i guess it was the age old, you read your work, but see what you think is there

Btw, parameter 2 should really be const.