Count 'std' Occurrences

Write a Python function `count_occurrences` that counts the number of times the substring `'std'` appears in a given string. The function should be case-sensitive and only count non-overlapping occurrences.

#### Example Usage
```python [main.nopy]
print(count_occurrences("letstdlenstdporstd"))  # Output: 3
print(count_occurrences("truststdsolensporsd"))  # Output: 1
print(count_occurrences("makestdsostdworthit"))  # Output: 2
print(count_occurrences("stds"))  # Output: 1
print(count_occurrences(""))  # Output: 0
```
def count_occurrences(s: str) -> int:
    """
    Count the number of occurrences of the substring 'std' in the given string.

    Args:
        s (str): The input string.

    Returns:
        int: The count of 'std' occurrences.
    """
    # Initialize a counter for occurrences
    count = 0
    # Iterate through the string to find 'std'
    # Placeholder for implementation
    return count
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