-void setString(char **, char *);
-boolean strEqual(char *, char *);
-boolean strEqualN(char *, char *, int);
-boolean strEqualCase(char *, char *);
-boolean strEqualCaseN(char *, char *, int);
-boolean strPrefix(char *, char *);
-boolean strSuffix(char *, char *);
-boolean strPrefixLower(char *, char *);
-boolean strSuffixLower(char *, char *);
-boolean isURL(char *);
+void setString(char **, const char *);
+boolean strEqual(const char *, const char *);
+boolean strEqualN(const char *, const char *, int);
+boolean strEqualCase(const char *, const char *);
+boolean strEqualCaseN(const char *, const char *, int);
+boolean strPrefix(const char *, const char *);
+boolean strSuffix(const char *, const char *);
+boolean strPrefixLower(const char *, const char *);
+boolean strSuffixLower(const char *, const char *);
+boolean isURL(const char *);