------
## 最终结论
```python
def get_max_occuring_char(s):
    char_count = {}
    for char in s:
        if char in char_count:
            char_count[char] += 1
        else:
            char_count[char] = 1
    
    max_char = ''
    max_count = 0
    for char, count in char_count.items():
        if count > max_count:
            max_count = count
            max_char = char
            
    return max_char

# Test cases
assert get_max_occuring_char("data") == "a"
assert get_max_occuring_char("create") == "e"
assert get_max_occuring_char("brilliant girl") == "i"
```