Can someone help me why this code don't copy the second array to first?

Question

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

void copy(char *oldyear,char *newyear){
int i=0;
while(*oldyear=NULL){
(*oldyear+i)==(*newyear+i);
i++;
*newyear++;
*oldyear++;
}

}
int main() {

char s1[]="Welcome to 2018";
char s2[]="Welcome to 2019";

puts(s1);
puts(s2);

void copy(char s1[],char s2[]);

puts(s1);
puts(s2);
return 0;
}

Answer 1

= use for assigment.
== use for comparison.

Re check the code if there any operator used in a wrong way. Its pretty easy to spot

Answer 2

Really? That is the just problem of this code ? If it is,this is so annoying 😂

Answer 3

Thank you if I can't edit correctly I will write again here. Happy new year you too :))

Answer 4

I can't edit correctly still. Do you have chance to write full code and send to me ?

Answer 5

Thank you a lot . Good night . Marry christmas again :)))