fix some file extensions

Task/Caesar-cipher/TUSCRIPT/caesar-cipher.tu

@@ -0,0 +1,24 @@
+$$ MODE TUSCRIPT
+text="THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"
+PRINT "text orginal    ",text
+
+abc="ABCDEFGHIJKLMNOPQRSTUVWXYZ",key=3,caesarskey=key+1
+secretbeg=EXTRACT (abc,#caesarskey,0)
+secretend=EXTRACT (abc,0,#caesarskey)
+secretabc=CONCAT (secretbeg,secretend)
+
+abc=STRINGS (abc,":</:"),secretabc=STRINGS (secretabc,":</:")
+abc=SPLIT (abc),         secretabc=SPLIT (secretabc)
+abc2secret=JOIN(abc," ",secretabc),secret2abc=JOIN(secretabc," ",abc)
+
+BUILD X_TABLE abc2secret=*
+DATA  {abc2secret}
+
+BUILD X_TABLE secret2abc=*
+DATA  {secret2abc}
+
+ENCODED = EXCHANGE (text,abc2secret)
+PRINT "text encoded    ",encoded
+
+DECODED = EXCHANGE (encoded,secret2abc)
+PRINT "encoded decoded ",decoded