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#include <stdbool.h>
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#include "include/stdlib.h"
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int atoi(const char* s) {
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bool neg = false;
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if(*s == '+') {
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s++;
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} else if(*s == '-') {
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neg = true;
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s++;
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}
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int n = 0;
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while(*s >= '0' && *s <= '9') {
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n *= 10;
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n += (*s - '0');
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s++;
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}
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return neg ? -n : n;
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}
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