how to return a string in function?

[xxx]

I have try this for 10 time but it can't work and I'am sure my logic is correct, is this coding correct::

#include<stdio.h>
#include<conio.h>
//======================================
char* Decodestr(char* encodedstr,char* codestr);
//======================================
void main(){

char encodedstr[6]=" ";
char codestr[6]=" ";

clrscr();
printf("Enter String:");
scanf(" %s",&encodedstr);
printf("Enter Code:");
scanf(" %s",&codestr);
Decodestr(encodedstr,codestr);
printf("Encoded Result Is:%s");
getch();
}
//========================================
char* Decodestr(char* encodedstr,char* codestr){

char *p1, *p2;
p1=encodedstr;
p2=codestr;
char ans[6]=" "

while(*p1!='\0'){
ans[c]=*p1 + *p2;
p1++;
p2++;
c++;
}
return;
}
//======================================