#include <stdio.h>
#include <string.h>
void MergeString(char s[],char s1[],char s2[])
{
int i = 0;
char *p,*q;
p = s1;
q = s2;
while(*q != '\0') q++;
q--;
while(*p != '\0' || *q != '\0')
if(i % 2 == 0) s[i++] = *p++;
else s[i++] = *q--;
s[i] = '\0';
}
...