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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