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Steadybox
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Source Link
Steadybox
  • 16.5k
  • 5
  • 41
  • 84

C, 107 bytes

#define p(x) printf("%c",x);
f(char*s){for(;*s>64;s++)p(*s)p(10)for(;*s<58;s++)p(*s)p(10)for(;*s;s++)p(*s)}

Call with:

int main()
{
   f("UK7898S14");
   return 0;
}