Avoid unneccessary type cast

src/json_parser.cpp

@@ -55,8 +55,8 @@ int read_objects_from_intputfile(const char *input_file, char **varname_list, ch
         if (((strstr(cline, ":")) && ((strstr(cline, "\"")))) &&
             (!(strstr(cline, "comment")) && !(strstr(cline, "Comment")))) {
             //count number of double quotes and colon signs
-            occurence_doublequotes = count_occure_charinstring(cline, (const char *)"\"");
-            occurence_commas = count_occure_charinstring(cline, (const char *)",");
+            occurence_doublequotes = count_occure_charinstring(cline, "\"");
+            occurence_commas = count_occure_charinstring(cline, ",");
 
             //only two pais of double quotes are allowed per line
             switch (occurence_doublequotes) {