Implement Custom strcmp function

Code

#include <stdio.h>

int custom_strcmp(const char *a, const char *b) {
    // Your logic here

    int i,j;
    for(i=0;a[i]!=0;i++);
    for(j=0;b[j]!=0;j++);
    int n;
    n = (i>j)?i:j;
    
    int k=0;
    
    while(n){
        if(a[k] != b[k]){
             int m;
             m = a[k] - b[k];
             return m;
        }
        k++;
        n--;
    }
    return 0;
}

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