# C, <s>123</s> 121 bytes

Very naive approach: 3 nested loops.
```
k,n;main(int c,char**v){char*a,*b;do for(c=n++,a=v[1];*a;a++)for(k=c--,b=v[2];*b;b++)k--||printf("%c%c",*a,*b);while(k);}
```
Compile, then run the executable with the two strings as parameters.