Style more consistent, replace capitalization with camel case

bin/miniImpInterpreterReg.ml

@@ -110,7 +110,7 @@ let () =
       | None -> ()
       | Some l ->
         Printf.printf "Error: undefined variables: %a\n"
-          DefinedVariables.Variable.pplist l;
+          DefinedVariables.Variable.pp_list l;
         exit (-1)
     ) else ();
 
@@ -126,7 +126,7 @@ let () =
 
     let return_value =
       return_value |>
-      ReduceRegisters.reduceregisters registers |>
+      ReduceRegisters.reduce_registers registers |>
       RISC.convert
     in