--- a/c/regexParser/createRegexParser.cc	Sat Nov 21 18:04:25 2015 +0900
+++ b/c/regexParser/createRegexParser.cc	Mon Nov 23 15:54:19 2015 +0900
@@ -2,11 +2,11 @@
 #include <stdio.h>
 #include "regexParser.h"
 
-NodePtr createNode(RegexInfoPtr,unsigned char,NodePtr,NodePtr);
-NodePtr charClass(RegexInfoPtr);
-NodePtr group(RegexInfoPtr);
-void token(RegexInfoPtr);
-NodePtr regexAtom(RegexInfoPtr);
+static NodePtr createNode(RegexInfoPtr,unsigned char,NodePtr,NodePtr);
+static NodePtr charClass(RegexInfoPtr);
+static NodePtr group(RegexInfoPtr);
+static void token(RegexInfoPtr);
+static NodePtr regexAtom(RegexInfoPtr);
 NodePtr regex(RegexInfoPtr);
 
 /**
@@ -15,11 +15,12 @@
  *     regexPosition(state)
  *     stateTransitionTable
  */
+
+static
 NodePtr createNode(RegexInfoPtr ri,unsigned char character, NodePtr left, NodePtr right) {
     NodePtr n = (NodePtr)malloc(sizeof(Node));
     if (n == NULL) {
-        fprintf(stderr, "Failed to allocate memory.\n");
-        exit(-1);
+        mallocFailedMessage();
     }
 
     n->tokenType = ri->tokenType;
@@ -44,11 +45,11 @@
 }
 
 // <charClass> ::= '['<literal>'-'<literal>']'
+static
 NodePtr charClass(RegexInfoPtr ri) {
     NodePtr n = (NodePtr)malloc(sizeof(Node));
     if (n == NULL) {
-        fprintf(stderr, "Failed to allocate memory.\n");
-        exit(-1);
+        mallocFailedMessage();
     }
     while (ri->ptr[0] == '-') {
         ri->ptr++;
@@ -57,6 +58,7 @@
 }
 
 // <literal> ::= [a-z][A-Z][0-9]
+static
 NodePtr literal(RegexInfoPtr ri) {
     NodePtr n = createNode(ri,ri->ptr[0],0,0);
     ri->ptr++;
@@ -64,12 +66,12 @@
 }
 
 // <group> ::= '('<regex>')'
+static
 NodePtr group(RegexInfoPtr ri) {
     return regex(ri);
 }
 
-
-
+static
 void token(RegexInfoPtr ri) {
     while (ri->ptr[0] != '\0') {
         if (ri->ptr[0] == '('){
@@ -124,6 +126,7 @@
 }
 
 // <regexAtom> ::= <literal>|<charClass>|<group>
+static
 NodePtr regexAtom(RegexInfoPtr ri) {
 
     token(ri);