formatting

.editorconfig

@@ -0,0 +1,10 @@
+# editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

01a.lisp

@@ -1,7 +1,7 @@
 (require :uiop)
 
 (defun split-instruction (s)
-  "Splits a string S into two parts at the given INDEX."
+  "Splits the given instruction into a pair"
   (cons (subseq s 0 1)
         (subseq s 1)))