C strlen implementation

#include <stdio.h>

size_t custom_strlen(const char *str);

int main() {
    const char *text = "Hello, World!";
    size_t length = custom_strlen(text);
    printf("Length of the string: %zu\n", length);

    return 0;
}

size_t custom_strlen(const char *str) {
    size_t length = 0;

    while (*str != '\0') {
        length++;
        str++;
    }

    return length;
}