Making strlen function

 #include<stdio.h>

int strlen(char * st){

    char *ptr = st;

    int len=0;

    while(*ptr!='\0'){

        len++;

        ptr++;

    }

    return len;

}


int main(){

    char st[] = "sunil";

    int l = strlen(st);

    printf("The length of this string is %d", l);

    return 0;

}

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