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pub fn impl_exchange(start_str: &str, start_num: usize, sql: &str) -> String {
let mut last = ' ' as u8;
let mut sql = sql.to_string();
let mut sql_bytes = sql.as_bytes();
let mut placeholder_idx = start_num;
let mut index = 0;
loop {
if index == sql_bytes.len() {
break;
}
let x = sql_bytes[index];
if x == '?' as u8 && last != '\\' as u8 {
sql.remove(index);
let mut i = 0;
for x in start_str.chars() {
sql.insert(index + i, x);
i += 1;
}
sql.insert_str(
index + start_str.len(),
itoa::Buffer::new().format(placeholder_idx),
);
placeholder_idx += 1;
sql_bytes = sql.as_bytes();
} else {
last = x;
}
index += 1;
}
sql
}