TextInterpolate

void TextInterpolate(char *Out, const char *In, char Prefix, const char *ReplaceThis, const char *ReplaceWith[]) {
  while(*In) {
    if(*In != Prefix)
      *(Out++) = *(In++);
    else {
      In++;
      char *Find = strchr(ReplaceThis, *(In++));
      if(Find) {
        int This = Find - ReplaceThis;
        strcpy(Out, ReplaceWith[This]);
        Out += strlen(ReplaceWith[This]);
      } else {
        *(Out++) = Prefix;
        *(Out++) = In[-1];
      }
    }
  }
  *Out = 0;
}