Encoder decoder by 51b

import std.cstream;void main(){auto s=din.toString;for(int i=6,j=s.length;*s%2?j>6:i<j;)dout.write=s[~*s%2?--j-++i&&dout.write(s[i]),j:++i>j?j-=2:i++];}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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