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Revert example code update
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13.md
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13.md
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@ -48,37 +48,30 @@ Validating
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Here is some reference C code for calculating the difficulty (aka number of leading zero bits) in a nostr event id:
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```c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int zero_bits(unsigned char b)
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{
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int n = 0;
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int countLeadingZeroes(const char *hex) {
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int count = 0;
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if (b == 0)
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return 8;
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for (int i = 0; i < strlen(hex); i++) {
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int nibble = (int)strtol((char[]){hex[i], '\0'}, NULL, 16);
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if (nibble == 0) {
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count += 4;
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} else {
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count += __builtin_clz(nibble) - 28;
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break;
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}
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}
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while (b >>= 1)
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n++;
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return count;
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return 7-n;
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}
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int main(int argc, char *argv[]) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <hex_string>\n", argv[0]);
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return 1;
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}
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const char *hex_string = argv[1];
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int result = countLeadingZeroes(hex_string);
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printf("Leading zeroes in hex string %s: %d\n", hex_string, result);
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return 0;
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/* find the number of leading zero bits in a hash */
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int count_leading_zero_bits(unsigned char *hash)
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{
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int bits, total, i;
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for (i = 0, total = 0; i < 32; i++) {
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bits = zero_bits(hash[i]);
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total += bits;
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if (bits != 8)
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break;
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}
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return total;
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}
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```
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