Fix binstr_to_int loop bug. Add lf prefix

src/math.c

@@ -1,28 +0,0 @@
-#include <string.h>
-
-#include "math.h"
-
-int max_int(int a, int b) {
-    if (a > b) {
-        return a;
-    }
-    return b;
-}
-
-int min_int(int a, int b) {
-    if (a < b) {
-        return a;
-    }
-    return b;
-}
-
-int binstr_to_int(const char *s) {
-    int n = 0, m = 1;
-    for (size_t i = strlen(s) - 1; i >= 0; --i) {
-        if (s[i] == '1') {
-            n += m;
-        }
-        m *= 2;
-    }
-    return n;
-}