STRLEN implementation in C

Two methods mentioned below

Method 1:

//Program to implement strlen

#include <stdio.h>

int my_strlen(const char *src){
    int count = 0;
    while(src[count] != '\0')
        count++;
    return count;
}

int main(){
    char src[] = "umesh";
    printf("length of src = %d\n", my_strlen(src));
    return 0;
}

Method 2:

#include <stdio.h>

int my_strlen(const char *src){
    const char *ptr;
    for(ptr = src; *src; src++);
    return (src - ptr); // Address is subtracted.
} 

int main(){
    char src[] = "umesh";
    printf("length of src = %d\n", my_strlen(src));
    return 0;
}