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-1 byte thanks to ceilingcat!
o;*t;f(*r,a,b,s){r?t=r,s="",*t=0:0;*t|=!strcmp(a,s);for(int v=2,c=*(char*)b;v--&&c;&&c;f(0,a,b+1,o))asprintf(&o,"%s%s",v?s:&c,v?&c:s),f(0,a,b+1,o);}
Try it online!Try it online!
o;*t;f(*r,a,b,s){r?t=r,s="",*t=0:0;*t|=!strcmp(a,s);for(int v=2,c=*(char*)b;v--&&c;)asprintf(&o,"%s%s",v?s:&c,v?&c:s),f(0,a,b+1,o);}
Try it online!
o;*t;f(*r,a,b,s){r?t=r,s="",*t=0:0;*t|=!strcmp(a,s);for(int v=2,c=*(char*)b;v--&&c;f(0,a,b+1,o))asprintf(&o,"%s%s",v?s:&c,v?&c:s);}
d;*t,e;fo;*t;f(*r,a,b,qs){r?t=r,q=&es="",*t=0:0;*t|=!strcmp(a,qs);for(int v=2,c=*(char*)b;c&&vb;v--;&&c;)asprintf(&d&o,"%s%s",v?qs:&c,v?&c:qs),f(0,a,b+1,do);}
d;*t,e;f(*r,a,b,q){r?t=r,q=&e,*t=0:0;*t|=!strcmp(a,q);for(int v=2,c=*(char*)b;c&&v--;)asprintf(&d,"%s%s",v?q:&c,v?&c:q),f(0,a,b+1,d);}
d;*t,c;e;fe;f(*r,a,b,q,n){r?t=r,q=&e,n=0,*t=0:0;*t|=!strcmp(a,q);for(int v=2,c=*(char*)b;c&&v--;)asprintf(&d,"%s%s",v?q:&c,v?&c:q),f(0,a,b+1,d,n+1);}
d;*t,c;e;f(*r,a,b,q,n){r?t=r,q=&e,n=0,*t=0:0;*t|=!strcmp(a,q);for(int v=2,c=*(char*)b;c&&v--;)asprintf(&d,"%s%s",v?q:&c,v?&c:q),f(0,a,b+1,d,n+1);}
