Function zhiChar

Heavenly Stems (天干) and Earthly Branches (地支) calculations. Used for year/month/day pillars in traditional Chinese timekeeping.

zhiChar(index: number): string
Get an Earthly Branch (地支) character by index
Parameters
- index: number
  Branch index (0-11), wraps around for out-of-range values
Returns string
The corresponding Chinese character
Example
```
zhiChar(0)   // "子"
zhiChar(11)  // "亥"
```
- Defined in ganzhi.ts:164