':param sql_statement: A SQL injection such as 47" OR "47"="47" OR "47"="47
:return: 47 OR 47 47 OR 47 47
This is useful to test if the parameter we\'re testing is actually
a search engine which is returning search results, and not a sql engine
which is being injected.'

def _remove_all_special_chars(self, sql_statement):

    for special_char in self.SPECIAL_CHARS:
        sql_statement = sql_statement.replace(special_char, '    ')
    double_spaces = '        '
    while (double_spaces in sql_statement):
        sql_statement = sql_statement.replace(double_spaces, '    ')
    return sql_statement
