Implement Custom strcmp function

Code

#include <stdio.h>

int custom_strcmp(const char *a, const char *b) {
    // Your logic here
    int len=0,count=0;
    while((a[len]!='\0' )|| (b[len] !='\0')){
      len++;
    }
    for(int j=0;j<len;j++){
        if(a[j]=='\0' || b[j]=='\0') {
            count+=a[j]-b[j];
            break;}
        else   count+=a[j]-b[j];
        
    }
    return count;
}

int main() {
    char a[101], b[101];
    fgets(a, sizeof(a), stdin);
    fgets(b, sizeof(b), stdin);

    // Remove newline
    int i = 0;
    while (a[i]) {
        if (a[i] == '\n') { a[i] = '\0'; break; }
        i++;
    }
    i = 0;
    while (b[i]) {
        if (b[i] == '\n') { b[i] = '\0'; break; }
        i++;
    }

    printf("%d", custom_strcmp(a, b));
    return 0;
}

Solving Approach