Implement Custom strcmp function

Code

#include <stdio.h>

int custom_strcmp(const char *a, const char *b) {
  // Your logic here
  int i = 0;
  while (a[i] != '\0') {
    if (b[i] == '\0') {
      return a[i];
    } else if (a[i] != b[i]) {
      return a[i] - b[i];
    } else {
      i++;
    }
  }
  if (b[i] != '\0') {
    return -b[i];
  }
  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